Circuit training is a form of physical exercise that combines strength exercises, or weight training with endurance exercises, or cardiovascular training. It can be used by a single person following an exercise routine or by a group of people who rotate among training stations. This type of routine works out the whole body in a single session. Many people find that circuit training is a great way to exercise without the need for equipment. An example of an exercise rotation can include push-ups, sit-ups or other form of abdominal training, jumping jacks and squat thrusts. In cases like this, a person does as many repetitions of an exercise as possible during a fixed time period, before moving to the next station. Between stations, there is a 20 to 30 second recovery time allowed, but never more than that, as the heart rate would go down too much.