General Tips
Use a back belt for all three movements. You can never be too safe when it comes to protecting this very vulnerable area of your body. Warm up with five to ten minutes on the treadmill to prepare the body, and always use two warm up sets per body part to prepare the muscle group for the torture it is about to endure with the Big Three.
Bench Press Tips
Avoid going too high or too low. While powerlifting competition requires total “bottom out” and lock-out, training in the gym does not. Keeping the barbell in the middle 80% range of motion maintains continual stress upon the muscle group, and avoids straining the joints (by locking out) stretching the pecs into a tear (common when bottoming out).
Deadlift Tips
Always keep the head up and back upright throughout this movement. Many bodybuilders, especially on the max out sets, will focus upon the weight and not the form they’re using to move it. This can cause an injury which will last a lifetime. Always have gloves with wrist wraps handy. The back should give out on deadlifts – not the forearm grip. Additionally, always hit the back first in your workout when your body’s resources and central nervous system are at their strongest.
Squat Tips
Always use a full range of motion. Stopping before the thighs are parallel to the ground places a great deal of stress upon the knees and is the most common cause of injury among bodybuilders on leg day. Warm up the legs, but don’t do excessive stretching before squatting. Between sets, always massage any kinks or sudden pains in the thigh or knee immediately to ensure that a small ding doesn’t become a major injury when the stress of the next set begins.
Summary
Source: www.BodybuildingToday.com