Bootcamp is a type of group physical training program. It became popular in the U.S. in the late 1990s. Our workouts always vary and include new elements. However, the general structure includes a fairly intense mix of aerobic, strength training and speed elements within each class session. One boot camp workout might stress calisthenics, while another stresses military-style drills. In most cases, you can expect to do calisthenics, such as pull-ups, pushups, lunges and crunches, as well as drills and sprints. A bootcamp workout is essentially a type of interval training — bursts of intense activity alternated with intervals of lighter activity.