Crunch with alternate hip flexion ("Crunch" Core/abdominal strengthening, with marching legs)
Lie on your back with your knees bent and feet on the floor.
Place your hands lightly behind your head and curl your upper body up into a crunch position.
Holding the crunch, lift one knee in towards you, then lower it back down before lifting the other knee.
Required equipment: No equipment, Mat
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