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About Us



Marina Shternfeld – Certified personal trainer, group fitness instructor and owner of Marina’s Fitness Studio in Manalapan, NJ (Piloxing with Marina). Certified in RealRyder indoor cycling; Piloxing; Piyo; Yoga; Buti Yoga and TRX; Certified technician for Juka Cryotherapy.


William Shternfeld – has over 35 years of experience in martial arts, was a member of the US Karate Federation. He is a 7 time national champion and 5 time all American champion. Certified in RealRyder indoor cycling; Certified technician for Juka Cryotherapy.


"A couple that sweats together, stays together." We believe that a healthy life leads to a happy life. We are happily married for almost 17 years and have two sons, ages 12 and 13.5. We lead a very active lifestyle. Our children are involved in various sports and excel in academic studies. Marina has a women’s only fitness studio in Manalapan, NJ where she trains, coaches and instructs various group classes. William is a personal trainer specializing in Martial Arts technique fused with Cross Fit and HITT. Together, we share a passion for fitness and healthy lifestyle which we love to share with our community.