What types of exercises do you need to do in order to bulk up? In the gym, you always see these super skinny guys doing hundreds of bicep curl exercises, but even after a year of going to the gym, they seem to have gained no muscle. The problem is that they are doing the wrong types of exercises for what they want to achieve. If you are skinny and a beginner at weightlifting, then you should forget about isolation exercises and instead do compound exercises. Even if you are experienced in the gym, if your goal is to bulk up, then compound exercises should be the primary type of exercises that you are doing as well.