"More strength is more muscle. The heavier the weights you lift, the stronger your body becomes, and the bigger your muscles grow. Your muscles increase in size so they can lift heavier weights. This is why strength is size – lift heavy weights and you’ll gain muscle mass naturally. Most people try to build muscle by doing high rep isolation exercises until pumped and sore. But this rarely works because you can’t lift heavy enough to trigger muscle growth. Only lifters who are already strong or use drugs can build muscle by doing mostly isolation exercises like curls and flies. Natural lifters need compound exercises to build muscle. You need to mostly Squat, Bench, Deadlift, OHPress and Row. You need to lift heavy. Do this and you can gain up to 43lb of muscle without using drugs or training more than three times a week. This even works for skinny hardgainers like me. This is definitive guide to building muscle naturally. Read more https://stronglifts.com/build-muscle/ "