How to Warm-Up While On Stage as published by Kelly Dinardo on the Candy Pitch March, 2009. Did 'hair & make-up' go too long before you heard "you're on"? That's ok. You can build a warm up for your own safety into your every performance! If not, you can take 30 seconds to do this right before going on stage. Coming from a major injury to my hamstring, I can tell you that warming up is without question, the most important thing you can do for yourself before performing. I hurt myself on a cold December day during an audition which I didn't have time to warm up for! Because I do acrobatics during every performance, I have now devised a system that will ensure I didn't cool down while waiting to go on stage.