The leg up PowerBlock crunch position the legs perpendicular to the torso and strengthen the abdominals and obliques. The leg-up position challenges the transverse abdominus, the biggest stabilizer of the spine. The dumbbell makes flexion of the spine more difficult, therefore increasing the difficulty of this strength training exercise. Depending on your workout plan goals - choose a lighter dumbbell for muscular endurance or a heavier one for muscular strength.
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