Catalina has been practicing making her calf muscle contract without moving her feet, and you shall see the results of her hard work in this clip. First you see her left calf slowly bouncing, then her right, with the camera zooming in so you can see all the fibers twitching with each contraction. At the end, she does some seated calf raises just to show how angular her big calves really are. If you like muscle control, you will love this clip! Get it now.