The push up is a full body exercise, and when performed properly, it will activate a large number of muscle groups in your body. (fitnessandpower.com)
These allow for intense work on a maximum number of muscle groups in a minimum amount of time. (bodybuilding-wizard.com)
This stretch is good for a warm - up because it does a great job of activating and recruiting lots of muscle groups as well as increasing your body temperature. (weckmethod.com)