You're training hard every day with your program, going heavy on the weights and sweating up a storm with cardio. Newsflash: While that's critical to your ultimate success, that's just not enough for you to lose the fat you want to.

To reach your get-lean goal, you must also follow a get-lean diet. Why? Even if you work out hard for an hour every day, that still leaves 23 more hours for you to wreck all your hard work in the gym with just one slip-up: a measly handful of chips, a drink with the girls or a burger at lunch. Diet is a huge, so to speak, part of the fat-loss equation. It's the backbone of your entire plan, the foundation of a hard body.