Taekwondo's popularity has resulted in the varied evolution of the martial art into several domains: as with many other arts, it combines combat techniques, self-defense, sport, exercise, meditation and philosophy. Training generally includes a system of blocks, punches, and open-handed strikes and may also include various take-downs or sweeps, throws, and joint locks following the BTCB Syllabus (British Taekwondo Control Board) depending on the programme the student is enrolled to.