For your looks, for your health, for feeling your best, abdominals don't just give you a flat, rippled stomach to show off with pride, they're the most important exercise you can do to prevent poor posture, back pain, and other injuries. Strong abs support the spine and eliminate stress throughout the body. Work every part of your midsection--upper, lower, and oblique or side muscles--with a series of wonderfully safe and effective exercises, all...