Credit: Photograph by Justin Steele

Why: Lengthens tight muscles.

Who: Cyclists, runners, and anyone who sits at a desk, which causes this muscle group to contract.

How: Sit on the floor with one ankle crossed over the other and the foam roller underneath the hamstrings. Press your palms into the floor and lift your butt a couple of inches. Slowly roll your hamstrings back and forth over the roller.