Looking to get a leg up on your bum knees? Try “Yoga Tune Up Quickfix Rx: KneeHab” ($20), a DVD with four routines designed to prevent pain and increase strength in those injury-prone joints. Despite the name, it doesn’t look much like a typical yoga practice.

Instructor Jill Miller has viewers roll on small balls, perform gliding moves (using a towel on a wood floor) and sink into deep stretches while she explains the anatomical reasoning behind the routine.