Make a breath in and hold the breath. Strain abdominal muscles and begin the crunch - first your shoulders and head, then your back come off the bench.Raise your body only due to effort of the abdominal muscles.Don't weaken abdominal muscles and don't touch the bench with your shoulders or the head until the end of a set. In the starting position your look is directed towards the ceiling, and during movement - it is always slightly above the crossed arms.

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