Rectus Abdominis Exercise: Six Pack on a Block

This rectus abdominis exercise is a killer. There is a lot going on as your move backwards into the position, working your balance your back, and your abs.

Eight Rectus Abdominis Muscle Workouts for those aiming for a six-pack.

Rectus Abdominis Exercise: Six Pack on a Block

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Eight Rectus Abdominis Muscle Workouts for those aiming for a six-pack.

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