Fitness Options -YMCA Fitness Gym We can access the YMCA gym facility for gym based rehabilitation programmes, providing a seamless transition from injury to performance and wellness. -Green Prescription Referral A Green Prescription (GRx) is a health professional’s written advice to become more physically active as part of your overall health management. A GRx would be good for you if: you are keen to become more physically active you want to improve your eating habits you have a medical condition which would improve with a change in lifestyle.