Beyond the jungle of treadmills, ellipticals, stair climbers and bikes is another maze of machines: contraptions with weights or cables or weights and cables. If you don't know what you're doing, we don't blame you for speed walking right past that equipment for another 45 minutes on the cardio machines. That's why we called on Ali Gritz, the assistant fitness manager at Crunch Gyms, to talk us through the best of the weight lifting machines. "A lot of woman are scared of the machines because they don't want to get too big, muscularly," she says. "But the reality is that creating lean muscle mass helps you get rid of body fat. Too many women do cardio for too long at an intensity that's too low — that's where weight lifting can actually help you." And, realistically, you'll never produce enough testosterone to get really jacked, anyway. So, go ahead. Follow Gritz's tips below, and we bet people will be asking you for ho...