Tubing apparently exercises muscles beneath the underarms, just back from the sides. These presumably are the "holding on for dear life" muscles. (They also presumably have a more technical name, but this is currently the easiest way to think of them...)
Ouchies
Tubing apparently exercises muscles beneath the underarms, just back from the sides. These presumably are the "holding on for dear life" muscles. (They also presumably have a more technical name, but this is currently the easiest way to think of them...)
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