Stretching the quads, or quadriceps, is important to warm up the large muscles of the thigh before exercise or sports. Learn how to do prone quad stretch exercises in this stretching and flexibility video. Take action: lie on your side, hold top foot behind butt, pull forward with quad, and pull back with hand. Tom Clifford, the instructor of this how-to video, has a degree in physical education, fitness and health from Eastern Michigan University, where he ran track and cross-country. Tom has worked as a personal trainer for two years. He also has a separate business where he coaches runners and triathletes for upcoming events. He currently works at Gold's Gym in Wilmington, North Carolina. Watch this video exercise tutorial from Live Strong and learn how to do the prone quad stretch.