How to do: 90-90 Crunches
Lie in a 90–90 position with your hip and legs. Place your hands behind your head and lift your shoulder blades up. Tap your feet up and down in the 90 angle position, holding a moment at the top. Lower and repeat!
Join the millions of exercisers who use Workout Trainer to get fit, fast! Go PRO+ today to unlock the best mobile workout experience, plus all custom training programs!