Seek balance when weight training. Work all of your major muscles, including your abdominals, legs, chest, back, shoulders and arms. But strengthen opposing muscles in a balanced way, such as the front of the shoulder and the back of the shoulder. Avoid exercising the same muscles two days in a row. You might work all of your major muscle groups at a single session two or three times a week, or plan daily sessions for specific muscle groups. For example, on Monday work your arms and shoulders, on Tuesday work your legs, and so on.