Legs

• There are a lot of muscles in the legs, starting up top with the glutes (butt muscles). The thighs, calves and ankles should all be worked when exercising the legs. An exercise that targets all parts of the lower body is the squat. This exercise requires that you put weight on your shoulder, squat down and straighten back up. Squats are usually done with a long barbell and free weights. If you'd rather use machines to work your legs, use the leg press, leg curl, leg sled and thigh shaper for a full workout.
  
  

Stomach

• The best exercises for the stomach muscles are crunches and sit-ups. These focus on your abdominal muscles. There are a lot of different variations of sit-ups and crunches, but they all generally require you to curl your upper body toward your lower body. These exercises can also be accentuated with machines designed to target the abs (not infomercial ab products such as ab belts, but machine that can be found in professional gyms). Also, exercise your lower back if you want to strengthen your abs. The back and stomach need each other, as well as your obliques. If you exercise your stomach, work the sides and back of your body, too.
  
  

Aerobics

• Running and bicycling is a great way to tone the muscles in your legs and stomach, but it also works your cardiovascular system. Doing aerobic exercises should always be included with weightlifting. It's a great way to get your blood flowing before you head over to the machines to target muscles. Try riding your bike or running to the gym. Don't make your leg and stomach exercises primarily about the weights.