fun now fitness forever !


kid classes

Summer Class Packs

Join H2K this summer for some of our super unique and fun fitness classes. The best part is that there is no commitment necessary for the summer! Purchase one of our 5, 10 or 15 class packs and use it as you go. We will be offering family and me classes, tiny kids kickboxing, kids zumba, kids obstacle course/circuit training, family mediation and more! Class packs are limited and must be used by Labor Day Weekend.

Zumba Kids Junior

Zumba Kids junior combines fast and slow rhythms for children ages 4-7 yrs using an aerobic/fitness approach. With a combination of dance, games, and peer performance your child will learn leadership, respect, team work, pride, confidence, responsibility, coordination, balance, and be able to express their inner creativity.
Arlington Classes

Teeny Tiny Yogis

Join us for our amazing Teeny Tiny Yogis class. This class is designed to guide your baby through yoga poses to help with body development and to help soothe the baby. Your Teeny Tiny Yogi will lie mostly on their back, stomach and in the arms of their Yogi Mommy. This class will provide an amazing bonding experience with mom and baby. Feel free to relax with other moms in our lounge after class.
Arlington Classes

Tiny Kids Cardio Kickboxing (3.5-6yrs)

Tiny Kids Cardio Kick Boxing will improve your child’s strength, coordination and self-confidence through relay races, obstacle courses and games! We will introduce your little one to basic boxing choreography and core work. Your child will start to learn meditation and what healthy goals mean.
Arlington Classes
Maynard Classes
Natick Classes
Concord Classes

Kids Cardio Kickboxing

Join us for the next level in Kids Kickboxing! Kids Cardio Kickboxing will teach your child self-defense, self-confidence, and discipline in a fun and safe environment. Kickboxing will improve their flexibility, coordination, strength, and concentration. They will learn boxing choreography, work on the bag and end each class with mediation and healthy goals.
Arlington Classes
Maynard Classes
Concord Classes

Middle School Kickboxing (11-14yrs)

Middle School Kickboxing will teach your child self-defense, self-confidence, and discipline in a fun and safe environment. They will work on circuit training, core exercises, partner drills, boxing choreography and bag work. They will also work on activities to improve their mind and body awareness. Each class will end with mediation and healthy goals.
Arlington Classes
Concord Classes

Zumba with your Toddler

Join us for our dynamic mom and toddler Zumba series. Dance around with your little Zumba star to fun and energetic music. We will play games, sing songs and have musical obstacle courses. Meet other moms while squeezing in a fun, quick workout!
Arlington Classes
Maynard Classes
Natick Classes
Concord Classes

CCOF-Cardio, Circuit, Obstacles, Fun!

CCOF is a new and unique way for children to learn team building exercises and skills. Through obstacle courses, mini circuit training, and all kinds of games, there will be a little something for everyone. Kids will build self-confidence and endurance. At the end of each class, each child will be responsible for updating their weekly exercise chart and are encouraged to meet fitness goals.
Arlington Classes

Kids Movement Classes 4-10yrs

Kids Movement classes range from hip hop, ballet, theater movement and intro to acro! Our kids movement classes are fun, upbeat, high energy classes for young dancers or for children interested in moving in a creative and safe environment. They will work on flexibility and will be introduced to basic movements to promote agility, self-confidence, and discipline. Like many of our H2K classes we will always end class with mediation and healthy goals.
Arlington Classes


adult classes

Teen and Young Adult Kickboxing

This fun and energetic  class is designed specifically for young adults. While it is still as challenging as an adult Kickboxing class, the music is upbeat, hip and specifically selected to create a unique and dynamic atmosphere. Teens will learn self-defense, self-confidence and also learn the benefits of meditation.
Arlington Classes
Concord Classes

Teen and Young Adult Zumba

Teen Zumba Fitness Party combines fast and slow rhythms that tone and sculpt the body using an aerobic/fitness approach to achieve a unique blended balance of cardio and muscle-toning benefits. Teens are in a safe, fun environment and don’t have to worry about dancing in the same class as their moms!
Arlington Classes

Family and Me Yoga Junior

Partner with your little one for animated yoga poses, games, music and breathing exercises that help to strengthen coordination and build body awareness. This fun class is a great opportunity for bonding with your child while strengthening their growing muscles and yours!! This class is perfect for moms or dads.
Arlington Classes

Family and Me Yoga

Just like our Family and Me Yoga junior you will explore a variety of poses with your child in a fun and safe environment. This class is geared towards older children, ages 7 and up. Come experience an amazing work while giving the gift of fitness to your child. This class is perfect for moms or dads.
Arlington Classes

Family and Me Zumba

Join us for our dynamic family Zumba series! Dance around with your little Zumba star to fun and energetic music. Play games and laugh while squeezing in a fun, quick workout!
Arlington Classes
Concord Classes

Family and Me Kickboxing

Bring your whole family for an 1hr of fitness fun. Learn punches, kicks and self-defense! We will have non-contact sparring, relay races and boxing drills. At the end of class we will have mediation and work on healthy goals. Make sure to bring water, wear comfy clothes and be prepared to sweat.
Arlington Classes
Concord Classes

Candlelight Yin Yoga

Candlelight yin yoga is a nice complement to the end of your busy day. Yin yoga gives your body a chance to stretch whether if it’s been sitting all day in one position or continuously running around. With Candlelight Yin yoga slip into an atmosphere that is calming to your mind.
Arlington Classes>

Prenatal Yoga

Alleviate some of the discomforts of pregnancy and prepare for childbirth with Hatha yoga, a combination of postures, breathing, meditation and relaxation techniques. Prenatal yoga provides additional benefits for pregnant women and their babies such as increasing strength and flexibility while improving sleep and reducing stress. Prenatal yoga classes will also help you meet and bond with other pregnant women and prepare for the stress of being a new parent.
Arlington Classes


about us

H2K children fitness
Meet our 1500 sf newly renovated space, with parents lounge and free wifi.
H2K children fitness
Here at H2K, we've got plenty of accessories to get you in shape while having fun.
H2K children fitness
With free parking all year round, there is no excuse for not stoping by!


H2K’s new home is in Arlington at the Ready, Set, Kids! family enrichment center. We have a spacious studio, which is perfect for all of our fitness classes and birthday parties! The center is designed with families in mind, complete with a lounge and play area for kids. We also have a second location in Sudbury at Crossfit Union. In addition to our two locations, we offer a variety of mobile classes state and nationwide.

Julia Walderzak, Owner

Screen Shot 2013-04-21 at 9.18.35 PMJulia Walderzak is the founder of H2K Happy Healthy Kids Fitness Studio. H2K is a unique fitness studio that specializes in non-competitive fitness for children and families. They offer kids yoga, kids zumba, kids kickboxing, kids circuit training, mom and baby yoga, zumba with your toddler, teen classes, camps and healthy birthday parties.

Julia began her career as a corporate event planner, but felt unfulfilled. As a child, she struggled with her weight and hated competitive sports, so she taught herself how to get fit and maintain a healthy lifestyle in other, non-competitive, ways. Knowing there is a huge population of children and families that are currently struggling with the same issues she had overcome, Julia developed the concept for H2K. H2K was created in hopes of helping these families, who have been under-serviced in the past, learn how to live happy, healthy lives.

Julia currently has her 4th degree red belt in Tai kwon Do and also has certifications in zumba, kids zumba, kickboxing, and kids and teen yoga. H2K is slated to open its 2nd location this fall in Arlington, MA. It’s first location is located in Sudbury, MA.



Shari Solomon

Shari Solomon 22Shari RYT 200hr, completed her hatha yoga training at Yoga For Life with Abby Schwab and yin yoga training with Josh Summers. She has been practicing and receiving the benefits of yoga since 2000 and meditation since 1978. Shari is also the founder of Cocoa Plum Nutrition.

Katherine Bright

katherine bright headshotKatherine graduated from Boston University with a Masters of Education in Coaching Principles and Sports Psychology and received her Bachelors in Psychology at Wheaton College. Katherine is NASM– Certified Personal Trainer, Pre/Post Natal Exercise Certified, and a USA Track & Field Level I & II Jumps and Combined Events Coach. When Katherine is not training clients, she can be found playing with her energetic son, running with him in a jogging stroller, and working out with her husband. KATHERINE’S CREDENTIALS: National Academy of Sports Medicine- Personal Trainer, American Council of Exercise– Pre/Post Natal Exercise Certified, 2010 United States Track & Field and Cross Country Coaches Association Division III, Indoor Track & Field Men’s Assistant Coach of the Year, NCAA Women’s Coaches Academy, Olympic Training Center.

Celeste LeMieux

Celeste HeadshotCeleste LeMieux is a certified 500 hr Kripalu Yoga instructor who has been teaching since 1997. She has been specialising in prenatal and postpartum yoga since 2002 and children’s yoga since 2006 when she became a certified Itsy Bitsy Yoga instructor. She taught many classes for Isis Parenting for 10 years and continues to teach at MIT, Harvard Vanguard, Healthworks and the BCAE. Celeste is passionate about supporting women in the childbearing year and beyond thru the practice of yoga, so they can be as happy and healthy as they can be for themselves and their families. She also really loves doing yoga with children to give them a fun and creative outlet for developing strength, coordination, balance and focus and as a way for them to develop self estem and express themselves uniquely.

Marcie Joy

Screen Shot 2013-04-21 at 9.18.35 PMMarcie has a Master’s in Elementary Education with Creative Arts Integration, and a Bachelor’s in Psychology with a focus on movement, music, and play therapy. Marcie has a dance minor and studied at NYU’s musical theater conservatory. She has spent over a decade working in Boston as an elementary school teacher, nanny, camp counselor, tutor, and children’s musical choreographer, and currently designs and implements music, art, and drama curriculum for children ages infant through teen. As a singer/songwriter, Marcie has made a name for herself in the dance music scene with top 10 releases worldwide. She writes and performs music for an interactive online English language program for Mandarin speaking students. Marcie’s songs and interactive activities stimulate children’s creativity and support self-expression through music, art, and play. Kids laugh, dance, jump, and learn alongside colorful props, puppets, and stories. Marcie’s energetic approach is ideal for school events, fairs, festivals, libraries, fun-filled birthday parties, playgroups, and more. You can download her original album of 20 songs for FREE on her website: www.kidsmusicbymarcie.com.

Suzanne Conlon

suzanne conlon headshotSuzanne has a love for kids and for yoga, so teaching at H2K is a joy! She has her 200-hour yoga certification from Charlotte Yoga (in Charlotte, NC) completed in 2008 with Grace Morales and MyLinda Morales. She has trained and practiced with a number of great teachers including Rolf Gates, Stephanie Keach, Michael Johnson, Christine Navarro, and Johnna Smith. She has her master’s degree in Community Counseling from UNC Charlotte with a specialization in play therapy. She worked as a school-based mental health therapist at an elementary school and loved pairing traditional mental health interventions with the fun and healing practices of yoga, meditation, mindfulness, and breath work. Her classes at H2K integrate yoga philosophy and traditional postures in a fun, playful way that challenges both adults and children to stretch their minds and bodies!

Nicole Siegel

Nicole HeadshotMovement has always been a part of Nicole’s life, as she has journeyed from dancer to movement therapist to yogi. Nicole has a passion for whole body wellness: the ability to connect mind, body, and spirit through breath and movement. She continuously strives to let go of the internal chatter and external distractions, and just simply be. Nicole completed her 500 hr. Yoga Teacher Training under the guidance of Daniel Orlansky and teaches in the Greater Boston area. She is certified in Vinyasa Yoga, Meridian Yoga, Thai Yoga Message,Yoga Nidra, and Childlight Yoga. As she works to deepen her practice, Nicole is looking forward to sharing her energy, enthusiasm, and passion for yoga with the H2K community!
“Breath is life, life is breath. There is no difference between the two.” Yogi Bhajan


birthday packs

H2K offers super fun and healthy birthday parties for your child!!

Birthday Party Package includes:
90 minute themed Yoga, Kids Cardio Kickboxing or Zumba Fitness Party,
Nutritious yummy Pizza,
Your choice of frozen yogurt cake,
Water and Juice,
Paper supplies,
H2K invitations,
T-shirt for the birthday boy or girl.
$26 per child/ 10 child minimum.

H2K also holds private events for Bar/Bat Mitzvahs, Corporate Events, Girl and Boy Scouts, Mom Groups, Private Zumba and Yoga Parties for Adults, Baby Showers and Bridal Showers. Please contact for rental rates and information.



H2K Happy Healthy Kids Spring Break and Summer Camps!

Join H2K this spring break and summer for our super fun and fit summer drop-off weeks.

H2K Wellness BootCamp!
Participants will learn how to practice and develop positive and healthy self- regulation skills by engaging in a variety of physical activities such as yoga, kickboxing, and hip hop dance. They will practice and study meditation, while using the arts as a therapeutic tool.

*Art Projects- will reflect a specific wellness topic of the day, and students will be able to gain a better understanding of wellness by engaging in these activities. They will also be able to choose one project to develop more in depth, for the final wellness presentation at the end of the BootCamp Session.

Zumba and Spanish Camp!
Get your groove on with this Latin-themed Zumba dance and movement class. 90 minutes of dance and exercise with H2K Happy Healthy Kids Fitness Studio followed by 90 minutes of Spanish activities with Yak Academy. Snack provided.

2 Day Pass: $100
3 Day Pass: $150
5 Day Pass: $225
10% Sibling Discount

What makes our summer drop-off parties super special is that we incorporate meditations that will help your child to focus, relieve stress and work on healthy goals. Everything that you would want for yourself and more. Give the gift of health!

Session 1: 9:00AM-12:00PM
Session 2: 1:00PM-4:00PM
Please see schedule for dates


vip memberships

VIP Membership is an exclusive program that gives you access to premiere benefits that H2K offers.

These benefits include:
10% off all classes and class packs (Does not include special programs, workshops, or nutritional counseling),
5 Free open gym passes,
Preregistration for VIP Members only,
Specialty private events for VIP Members,
Special gift for your child at their booked birthday party,
10% off of H2K Merchandise,
Free T-shirt!!


nutrition counseling

H2K offers private yoga lessons, and pre / postnatal personal training.

Please contact the studio about packages, pricing and scheduling. H2K’s private training offers a safe and nurturing environment for you to achieve your fitness goals. Babysitting also available upon request.”



“We’ve held 2 birthday parties at H2K for our 2 girls (ages 5 and 7) and couldn’t have been happier with the experience. Julia is super organized, creative, and energetic. From initial planning to welcoming guests to keeping the party fun to clean up, Julia took care of it all. She coordinated invitations, a face-painting vendor, food and all activities. She really made the experience easy and stress free for me, and the kids had a blast. I highly recommend birthday parties at H2K!”

Ashley Swenson

“Feeling SO good after a Zumba class at H2K tonight and a kickboxing class last night, because I have SO much fun while getting a great work out in at the same time. Julia ends her kickboxing sessions with a brief meditation which I love. Her Zumba classes are so fun because they include so many different styles of dance–salsa, burlesque, hip hop, jazz, etc. The studio is beautiful with an energy that immediately feels calm and comfy. The owner, Julia, is a sweetheart and very down to earth with a fun sense of humor, which immediately makes you feel comfortable and relaxed (important when trying something new!). Thumbs up!!! Can’t say enough good things about this place.”

Ashley Nicole

“I just recently started attending H2K Happy Healthy Kids Fitness Studio and I am in love! Don’t be deceived by the word ‘Kids’ because this fitness studio offers adult classes too! I have attended several kickboxing classes with Julia (the owner) as the instructor and she is fabulous! The kickboxing class is designed in a way that ensures you are getting in a great workout, but while having lots of fun along the way. Julia brings great positivity and energy to her classes while being mindful of building your confidence and offering lots of encouragement. Julia also offers variety in her classes, which I love because this gives me something to look forward to, while learning something new each time. While some gyms and fitness studios tend to become a bit “clicky” this studio is far from it. Julia caters to the needs of each of her customers with genuine care and thoughtfulness, and offers clarity when needed in a friendly manner. The atmosphere is great, and full of super friendly people. This studio is also extremely clean and organized. Super adorable and I highly, highly recommend!”

Kelsey Hogan

“Beautiful space. My 6 year old had a Zumba class there with her girl scouts and the instructors were amazing. They kept it age appropriate and fun for all the kids.”

Laura M.



2014BostonBestMedalBostonParents Paper

H2K Happy Healthy Kids Fitness Studio was proudly readers’ picks for the best sports classes around Boston in their 2014 Family Favorite Awards, featured in their annual publication Best of the Best.

Hula FrogHula Frog

Come check out why Hula Frog names us one of the most Loved Party Places! H2K offers awesome healthy birthday parties. You get your choice of Zumba, yoga or a kickboxing party. All parties include craft, paper supplies, balloons, pizza, frozen yogurt cake and a t-shirt for the birthday child.


find us

Sudbury/ Maynard

Victory Plaza
86 Powder Mill RD. (Jam Time)
Maynard, ma 01754
get directions


284 Broadway
Arlington, MA 02474
get directions

Arlington Location


Monday – Friday
10:00am – 9:00pm
Saturday – Sunday
9:00am – 12:00pm

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