Hip flexor and quads stretch post tennis play

Always perform this stretch AFTER tennis play. Slowly take your muscles to the end of their range & do not bounce. You will feel slight resistance in the muscle, … source
Dinamic warm up for Quads and Hamstring in motion

Warming up raises your heart rate, core temperature and blood flow to your muscles which minimizes the stress the body undergoes when you ask it to work … source
Dynamic Warm ups for winter runs (Hamstrings and Quads)

A smart warm-up routine before running gives your muscles, bones, and joints a chance to loosen up; it gradually and gently brings up your heart rate and … source