3. You didn’t master form first.
The race to add weight ultimately leaves many guys sacrificing form. They may be able to get by with less-than-optimal movement with lighter loads, but form errors begin to really become noticeable when the weight gets heavy. If you find yourself constantly going backward on major lifts, slide off the weight and practice the basics. Are you engaging your lats correctly during a deadlift? How are your shoulders positioned during a bench press? All of these small form corrections can play a major role in how much you can lift.