Looking to develop those six-pack abs to show off on the beach? Then yoga is not for you. If, however, you want to strengthen both your abdominals and your lower back, while keeping your stomach muscles supple but not rock hard, then yoga's the way to go. This two-part, 40-minute program from Yoga Zone uses a variety of poses (some of them joined together in flowing sequences known as vinyasas) that are obviously directed at the abs; the scale pose (also known as the boat), for instance, will certainly work those muscles hard, as will the table pose, the "forearm plank" (the upward pushup position, but with elbows on the floor), and others. But both parts of the practice also incorporate a variety of other asanas, such as standing positions and side stretches, that develop abdominal strength more subtly, as the instructors frequently remind you to tilt your pelvis forward and tuck your stomach muscles in, thus gently but firmly engaging your abs throughout your entire yoga routine.