Because they do not require weights, bodyweight exercises are the ideal choice for individuals who are interested in fitness but do not have access to strength training equipment. Weights can be incorporated to increase the difficulty of most bodyweight exercises and some exercises do require some sort of apparatus to lean on or hang from, but the majority of bodyweight exercises require only a floor. For those exercises that do require equipment of some kind, a substitute can usually be improvised, for example using a tree branch to perform pull-ups.