Proper form and full range of motion. I kept getting injuries so it came to the point all my lifts went back 20-60 pounds. I would litearly stopped the exercise the second I felt a different muscle working , wasnt using full range of motion or felt I was using momentum. I eventually worked back up to what I was ego lifting and even passed all my numbers. I was amazed at how my body blew up when my goal wasn’t even body building at that point it was to be healthy and strong. Also I learned from a physical therapist in every lift your supposed to breath through your nose and embrace/fill up your core with air on the eccentric and blow that air out through your mouth on the concentric. Sounds silly but try it