Amateur bodybuilder goes into a double bicep pose and flexes her great pectoral muscles so they seperate and put noticible stretch marks in her shirt! While keeping her chest muscles flexed, she then hits a second better double bicep pose, flexes her pecs harder, and slowly stretches her shirt even further!!! Just amazing control of her pec muscles!!! While not muscle control in the classic bouncing sense, I looped the scene to catch those moments of flexation with close ups and slo-mos. Watching her shirt stretch just from the power of her flexing pecs alone is a sight to behold!!! She cou... Show more