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Crunch Single Leg Lift

Performing the: A Step-by-Step Tutorial Crunch Single Leg Lift

Bend one knee and keep your foot flat on the ground while extending the other leg straight out.
Place your hands behind your head, keeping your elbows wide open.
Slowly lift your upper body off the ground in a crunch motion, while simultaneously lifting your extended leg off the ground.
Lower your body and leg back to the starting position and repeat the exercise, switching legs after each set.