Home Chevron Right Fitness Chevron Right Lying Leg Extension Lying Leg Extension In this video, Jennifer Widerstrom, trainer on The Biggest Loser, shows you how to do a move that can tone your legs and core, as well as improve your balance. Grab a resistance band and a bench to give your legs an amazing workout. Updated March 08, 2021 Advertisement Save Pin FB ellipsis More Tweet Mail Email iphone Send Text Message Print