If you're looking for an excellent full-body workout, add bicycle kicks to your circuit: a good ab exercise that works your abdominal muscles and chest, legs and arms. You don't need any equipment, and you can do it at home, but if you want a little extra challenge, try it while holding weights or carrying something in each hand. Although bicycle kicks exercises are easy to learn, they're tough to master. Be patient with yourself, and keep going until you feel confident.