masterslaveprimer: TIP: Combine this with the “clenching” exercises to round out your core muscle tone/control.  The more regularly you exercise the faster you will see progress.

masterslaveprimer: TIP: Combine this with the “clenching” exercises to round out your core muscle tone/control.  The more regularly you exercise the faster you will see progress.

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from: https://kinkgg.tumblr.com/post/133913216271