You might learn weight training techniques by watching friends or others in the gym, but sometimes what you see isn't safe. Incorrect weight training technique can lead to sprains, strains, fractures and other painful injuries that may hamper your weight training efforts.
If you're just getting started, work with a knowledgeable weight training specialist — a physical therapist, athletic trainer or other fitness specialist who's familiar with proper weight training technique. If you've been using weights for a while, consider scheduling time with a trainer to double-check your technique and identify any changes you may need to make.