A balanced workout includes chest exercises because this area contains some of the largest muscle groups in the upper body. Large muscles can handle more weight which can help you burn more calories.
Chest exercises are easy to add into you current program.
Your chest exercises with target the 2 muscles of this area: the pectoralis major and minor. These muscles are responsible for pushing and bringing your arm inward. By working these muscles, you also exercise the shoulder and arms which adds to the difficulty of your workout (this also helps to burn even more calories).
There are many workouts that will effectively work this area. Here are a few examples: bench press, pec deck (machine), arm flys and push ups. Push up are great as they can be done anywhere without equipment regardless of your exercise level. It is a good idea to choice a variety of workouts so you can target this area from a variety of directions. You can perform these up to 3 days a week with at least 48 hours rest between exercising. If you are lifting heavier weights, as would be the case in bodybuilding, you may need 2-3 days of rest.
Stretching is a vital part of this program. This area of the body is constantly in use and can get very tight. A great stretch is to take you finger and inter lace them on your lower back, gently pull down and up.
Make sure that you include back workouss to balance your program.