Lifters often focus on the large muscles that are more noticeable (i.e. chest and shoulders) and forget about the reciprocal muscle groups (i.e. scapular stabilizers). This leads to postural imbalance and increased chance of injury. Many rotator cuff injuries result from this seemingly harmless imbalance.
A good rule of thumb is to balance “pushers” with “pullers”. Pushers include; shoulders, chest, triceps, abs, quadriceps, and calves. Pullers include; biceps, back and posterior shoulder muscles and hamstrings. Pushers and pullers do not need to be worked during the same session; in fact they should probably be worked on different days. Perform resistance exercises 3-4 times per week and always start out light when first beginning a new regimen.