The large quadriceps muscles on the front of the thigh are important to target when strength and weight training to build overall muscle mass. Learn how to do quadriceps exercises in this strength training video. Take action: squats and lunges strengthen quadriceps, keep back straight, keep knees above heels in squats and lunges, and never lean forward during a lunge. Tom Clifford, the instructor in 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 fitness tutorial and learn how to strengthen the quadricep muscles.