If you want to gain weight and bulk up to build muscle strength, then you should work towards a slight calorie surplus, while exercising the muscles you want to build up.
Just as losing weight is a simple calorie in and out balance, so building muscle mass is the same equation. The more energy you take in by the way of food then the more you have to exercise to use it up so as not to put on weight. Those seeking to lose weight use that equation even thought they might not be aware of it. If their calorie intake exceeds that used through exercise, then they will put on weight in the form of fat or glycogen.
However, there is only so much glycogen that the liver will store as an emergency energy supply, and the excess will then be added as body fat. If we look at an alternative scenario, one in which that energy intake is still higher than the energy used in exercise, but that the exercise is taken in the form of some aerobic, but largely anaerobic, exercise in which oxygen is depleted, then the excess calories will not be converted to fat but to muscle […]

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