Want to tone your tummy without sit-ups or crunches? Yoga may help you do just that, says Colleen Saidman Yee, creator of Gaiam's Yoga for Weight Loss DVD. "As we age, we sort of collapse and deflate around the midsection," she explains. "Yoga helps to lengthen and extend the spine and strengthen those core muscles that have gotten so soft -- both of which can result in a flatter stomach."
For the most efficient core workout, Saidman Yee says, focus on moves that target not only the abdominals, but also the side obliques and the back. These muscle groups support the abs and help you maintain proper posture and alignment, both on the mat and off.
Try incorporating these five poses into your next yoga routine -- and if you feel shaky or can't hold them for too long, don't worry. Keep track of your improvement week by week: As your skill level improves, so will your six pack.