After my broken arm healed and my cast was removed, i found that my muscles had atrophied and it was difficult to use them in the same way i had before my injury. this statement refers to which of the sport training principles?

This statement refers to the sport training principle of reversibility. This principle essentially states that if an athlete or sportsperson is unable to train for a certain amount of time, their muscles will start to lose the benefits of the training they have done previously.