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Meet the Team

Fredrick Hahn

Fredrick Hahn is a certified personal trainer by the American Council on Exercise since 1990 and has been instructing 9 to 90 year olds for over 20 years. He instructs some of the world’s most prominent business men and women and celebrities in the world.

Since 1998, he’s owned and operated SlowBurn Personal Training Studios located on the Upper West Side of Manhattan and in Montclair N.J. He is the co-author, along with Drs. Michael and MaryDan Eades of the best-selling fitness book The Slow Burn Fitness Revolution (Random House 2003) and is the author of Strong Kids, Healthy Kids (AMACOM 2008)

Fred has appeared on numerous television and radio shows including NBC’s The Today Show, CNN’s The Biz, The 700 Club, WABC Morning Show, NBC Live at Five, Fox Five News, ABC Eyewitness News and much more.

Tommy Day

As a lifelong athlete (NCAA football, track and field, gymnastics) and as a trainer since 1991 (SFPA certified), I have had the opportunity to experience many different training techniques. For best results, my standard workout usually hovered around two to three hours (weights, cardio, stretch, shower), four times a week. If I did any less I felt I would be short-changing myself. Boy, was I wrong. I get the same results doing SlowBurn™ as I did before, and I don't have to organize my life around my workout! I love what SlowBurn™ does for my body and I love seeing what it does for our clients.

Madelene Fonesca

IFBB PRO Madelene Fonseca joined our team in February 2019. She has built her career around body building and general health improvement. Maddy will guide you to a new you, no matter goal may have - whether it's getting into better shape or, standing on the stage and winning a body building contest. Maddy is highly motivating, kind and understanding. She is a prime example that the SlowBurn method of resistance training and eating healthfully produces excellent results in just 30 minutes a week. For you too!

Ariel Davies

Ariel has always lived an active and healthy lifestyle and has been an ACE certified personal trainer for the past couple of years. He's been fortunate enough to discover The SlowBurn method and has taken full advantage of the opportunity. Now, he works out to complete fatigue in just a matter of minutes instead of spending hours in the gym 6 days a week like he used to. This leaves him with more time to do the things he loves like swimming, yoga, and hiking.

Jake Ditkoff

Jake Ditkoff is an American Council on Exercise certified personal trainer. He is a recent graduate from Rutgers University, where he majored in Psychology. Jake is passionate about helping people achieve their fitness goals and maximizing their potential. He is enthusiastic about the effectiveness and expedience of the SlowBurn method in his own life, and looks forward to sharing it with you!

Rosanne Guararra

Rosanne found her way to SlowBurn Montclair in 2014 while getting bagels next door and never left. An avid yoga enthusiast, Rosanne is a trained yoga instructor (200 RYT) and has taught at South Mountain Yoga and Yoga Mechanics and has been a guest instructor at Lululemon at Garden State Plaza.

Rosanne is a passionate and dedicated instructor in the SlowBurn method and her objective is getting her clients strong her while keeping them safe. Rosanne enjoys working with all her clients, but especially enjoys working with her grade, middle and high school kids and helping them reach their goals as she has worked in children’s publishing for many years before making the switch to the health and fitness industry.

Originally a native New Yorker, Rosanne lives in Montclair, in a book and art-packed apartment with her high school-aged daughter and three cats who love to watch TV.

Giulia Kasollari

Giulia Kasollari

Giulia (Julia) Kasollari is our amazing Client Concierge at SlowBurn personal training studios. She has a real passion for helping people. Giulia is majoring in psychology and minoring in health and nutritional sciences. Dear to her heart are the practices of meditation, hiking, Yoga and Pilates. She is happy to be part of our SlowBurn team ensuring that our clients feel welcomed and valued.

Adjunct Support Services


Leigh Hansen, Massage Therapist

Founder of Remedy Massage, Leigh has been helping her clients reduce stress and release muscular tension for the last 15 years. She received a BA in Dance from NYU in 1991 and performed and taught for several years. In 1997, she became a certified Gyrotonics instructor and began training clients while pursuing graduate studies in both dance and pre-med. Leigh received her Massage Therapy degree from the Swedish Institute in 2002 and opened her private practice that same year. An avid fan of the SlowBurn system, Leigh is grateful to the trainers at SlowBurn for helping her stay strong!

Montclair Backrub

Contact Information

NYC Location
169 West 78th Street
New York, NY 10024

[email protected]

Montclair, NJ Location
25 Watchung Plaza
Montclair, NJ 07042

[email protected]

As Seen On

700 Club CNN Fox News