Proper lifting technique can play a big role in gaining muscle. Rather than showing off and lifting heavy, it is better to stick with what you can and do it right. Lifting heavy weight wrong can put a huge strain on your body. You can stretch and tear muscles, or cause sprains, especially on the back. Not only should you stick with weight you can handle you should workout with a spotter if you're dealing with loose weight. Lifting alone can also cause injury. Not only may you lift wrong but dropping weight can be very dangerous.