As low as $25.99 Per Month!! Synergy Fitness offers many options for helping you find the best way to improve your health and fitness. All of our memberships include access to over 15,000 square feet of training facilities, all group fitness classes, menâs and womenâs locker rooms, boxing room and many other amenities. Please contact Synergy Fitness at (516) 593-9100 so we can personalize a membership to fit your needs and fitness goals.