How Skinny Guy Can Gain Weight and Build Muscle Hit the Gym for about 45 mins to an hour Build Muslce. Many of us think that just going to the Gym and lift will Build Muscles Stronger but just lifting Weights won’t increase Muscle. When I started, I did this mistake, so I want to encourage you to not just lift the same weight but increase with every reps. https://www.gogxn.com/blog-visit/how-can-someone-skinny-gain-weight-and-build-muscle/