Vertical leg crunches work the muscles of the thighs by curling the leg vertically, building muscle mass and tone. Learn how to do vertical leg crunch exercises in this strength training video. Take action: use a mat for comfort, keep legs as straight as you can, focus on crunching core and reaching toes, and exhale as you crunch. 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 do vertical leg crunches.