WHAT DOES THE RX MEAN AT THE END OF DIFFERENT FITNESS AND HEALTH RELATED TITLES?

There is a magazinew Fitness Rx. I hit also seen it utilised another places in another ways.
There is a entrepot Fitness Rx. I hit also seen the Rx utilised after another upbeat or shape attendant titles/topics.

Related posts:

1. WHAT ARE SOME GOOD HEALTH AND FITNESS RELATED PRIZE IDEAS?
2. WHAT LEVEL OF FITNESS IS REQUIRED BEFORE YOU START TAKING TAI KWAN DO?
3. HOW IS AEROBIC FITNESS RELATED TO YOUR SUCCESS IN BASKETBALL?