To avoid injury, correct form is paramount with this exercise! Practice good form before loading on the weight.
Never arch your lower back! Any arch in the lower back is asking for injury.
Lower the weight if you find that you are being pulled too far backwards when performing the clean and press.
Instructions
Begin the clean and press by placing a barbell on the floor in front of you and standing with your shoulders around shoulder width apart.
After loading the appropriate weight, make sure the bar is positioned over the tops of your feet at the mid-way point (half way between your toes and heel).
From this position, bend down and grasp the bar with an overhand grip.
Lower your buttocks to the ground until your thighs are parallel to the ground. Make sure your knees do NOT track out over your toes when doing so.
Look straight ahead and keep your back straight - make sure there is no arch in your lower back. You are now ready to begin the exercise.
Explode upward through your legs and quickly snap the weight up to your chest level in one fluid movement.
Continue the movement by pushing the weight straight above your head, using your shoulders and triceps to move the weight.
Under strict control, lower the weight back to your chest and then back to the floor in the same fashion.