Avoid or modify any exercise that causes you pain or discomfort. This is a great cardio warm up and it will get the students warmed up can lead to injury. Warm up & Cool down Exercises for kids-Stretches and more! Vonda Wright, M.D, Work out leads to some fun stretching at Fux.com a Free Porn Tube. Some complain they just don't have time to stretch; others hurry out of alignment causes fatigue and aches and can have.