Remember to inhale while lowering the bar and exhale while pressing the bar up. Remember, keep your feet on the floor. Do not arch your back. Lower the bar slowly so it does not bounce off your chest. Always train with a partner or spotter in case you get caught with too heavy a weight.
Advanced bodybuilders can do more.
Place your left foot straight forward and your right foot back 2-3 feet at approxiamately a 45 degree angle to your left foot. Place your left hand on your left knee. Grasp the lower cable handle with your right hand. Extend your arm completely. Your palm should be facing downward.