The underbutt is better known as the glute-ham tie in. Development of this area creates a nice sleek look to where the butt meets the upper thighs.

The underbutt is better known as the glute-ham tie in. Development of this area creates a nice sleek look to where the butt meets the upper thighs.

from Visual Impact Fitness™ https://ift.tt/2C38XC1
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