700-1 Union Pkwy
Ronkonkoma, NY 11779


Our Instructors


Marybeth has been in the industry since 1984 and with Platinum Fitness since 1993. Her classes are safe, fun and effective. Any member will benefit from being a part of her community.

Classes with Marybeth: G.R.T, Yoga Plus, Silver Sneakers Program



  Frank Lincoln has been a Spin instructor since 2005 and a cycling enthusiast for much longer than that. Frank’s class is motivational, challenging, hardcore, new school and old school. He will take you on rides to rock and dance beats from today and yesterday. Geared toward experienced and beginners…at the individual’s own pace. No judgment…just inspiration to push it to the next level!!

Kristina DiMartino


  Kristina DiMartino has been a Spin Instructor since 2013 and graduated in 2018 with her Doctorate in Physical Therapy. She placed third in her first triathlon in 2017 and is training for her second in August. She teaches her Spin Class at 5 a.m. every Tuesday and Thursday to a very dedicated following.


Classes with Lorri: Boxing Boot camp and High Intensity Interval Training utilizing kettlebells, weighted bars, elastic resistance, etc. w/ Lorri