What is your typical ‘warm up routine’ before you even pick up a racquet to play? Basically, my warm up routine consists of light jogging. Then I warm up my joints but I don’t stretch. The reason being is because stretching is simply pulling your muscles apart, but don’t you do that when you get cramps? When you get a cramp, it’s really when your muscles tighten up into a ‘cramp’ and when we stretch it out, we weaken it and try to pull the cramp out. So if you stretch before playing, you basically weaken your muscles.