Do the bench press right/
tip 1: three foundation points
HEAD, SHOULDERS, BUM
Your head, shoulders and bum should always stay in contact with the bench. This creates a stable base. Without stability, you'll have no strength.
The bum will often come off the bench as you raise up to reduce the range of motion when you come back down and to compensate for the weight. When pushing through your legs, remember to keep your glute muscles in contact with the bench.
If you lack flexibility in the pec minor, your head will also tend to lift up as you lower the bar down. If this happens, you should stretch between each workout to prevent your head being pulled forward when bench pressing.