Work out your entire body
There are some muscles you can clearly see and admire in the mirror and some muscles you cannot. A lot of gym goers usually train only the muscles on their arms, chest and shoulders and this is a grave error. Firstly, it will give you a disproportionate body that not many people like. Also, it will make you prone to injuries. Therefore, make sure you workout your entire body for a complete look.
Load up on protein
As informed earlier, you have to consume 300-500 more calories than your normal intake every day. You can do this by eating foods rich in protein like cheese, meat, eggs, etc.
Drink your calories
It may be tough to meet your calorie requirements by just eating. Drinking milk, milkshakes or protein shakes with little or no sugar can be a great way to load up on calories. Here are some healthy options for weight gain.