Piriformis
Credit: Photograph by Justin Steele

Why: Releasing painful trigger points in the buttocks, which can lead to hip and lower-back problems.

Who: Cyclists and people who do lots of squats or have lower-back issues.

How: Sit on the foam roller and cross your ankle over your thigh just above the knee. Put your weight onto one buttock. Roll back and forth. When you find a painful spot, pause there and try to relax your glutes.