Warming up involves gentle physical exertion before a performance or practice to prepare the body both physically and psychologically. There are two main types of warmups - general warmup which involves movements for the whole body like jogging and stretching, and specific warmup which focuses on movements similar to those in the main activity. When warming up, the body's cardiovascular, respiratory and neuromuscular systems are stimulated to increase heart rate, blood flow, breathing and muscle contraction to deliver more oxygen to working muscles, raise body temperature and prepare the body to burn calories and create energy for higher intensity exercise.