Madison Keys Faces the Challenge
Coming back after an injury is difficult in sports and in tennis something as simple as a strained wrist can take you off the court. Worse yet, once you take the time off you'll find it much more physically challenging to come back.
Suggestion: Don't give up on conditioning even if you're not playing tennis. Worst case, switch hands for some backboard time if it's your arm or wrist that is the problem. This might give you some options when scrambling and need that extra reach. You've seen all the top players throw the racket to the off hand when that extra foot of extension is needed just to get the ball back.
Back injuries don't allow much of anything but rest and rehabilitation. Take up cross training and conditioning that helps strengthen your back without injuring it.
Shoulder injuries are one of the worst along with hip and knee problems. The shoulder takes away your serve while leg injuries change your mobility. In tennis there are so many ways to be reduced in level of play that once the cycle of injuries begin you almost always think of what life is like without tennis.
Suggestion: Find a way to get on the court even if it is nothing but standing at the net and volleying with your off hand. You're still practicing your game.
