Volume 3, Sweat, is a slightly shorter version of the challenging class Kest teaches in person. There are still all the gentle, firm admonitions to listen to your body, not to feel competitive with anyone else in how you do the pose (and as long as you heed them, you'll do fine). But Kest combines the classic warm-ups and longer-hold poses with a rapid succession of sun salutes, which will be gratifying to the advanced yoga student, but may make a first timer feel as though he dropped in to a Rockettes rehearsal by mistake. But if you keep at it, the workout is very easy to follow, and Kest's gentle, gruff voice is so soothing you find yourself relaxing even as you're pushing your body to its limits. As long as you keep in mind his personal mantra--"If you're doing the best you can, you're doing this class perfectly"--you and Kest should have many satisfying years of workouts together. --Anne Hurley