Gaining weight is very easy, many people may gain a lot of weight for a short period of time. On the other side, building lean muscle mass can be very hard, especially for guys that have a fast metabolism, commonly know as hard-gainers. Also Read: How To Eat To Gain Muscle Mass - Diet Strategies For Hardgainers Like many of the people in the world that are fighting with a body fat, there are also many people that are struggling to gain weight and build muscle mass. If you are one of those from the second group, continue reading this article.   For everything in life you need three things - a goal, plan to achieve it and dedication. Those are three basic things to success in anything you want. You need to apply this rule and start your muscle building trip.  There are 3 main ways to make your muscles grow: 1. Force muscles to grow with the right training 2. Feed your muscles with enough healthy calories 3. Rest, re...