The calf muscles at the back of the lower leg are important to target when strength and weight training for speed and agility. Learn how to do calf muscle exercises in this strength training video. Take action: use platform or stairwell, stretch calves before flexing muscles, follow full range of motion to increase intensity, try using one leg for more resistance, and keep feet together or wide apart. 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 body sculpting tutorial and learn how to strengthen calf muscles.