Clenches are a type of grip or hold used in various activities. They are usually formed by the hands and fingers, and can be used to grasp objects or to apply pressure. The term 'clenches' is often used interchangeably with 'grips' and 'FISTS'. Grips and FISTS are two of the most common types of clenches, with grips being formed by the fingers and palms and FISTS being formed by the fingers and thumb. Clenches are used in many activities, such as martial arts, rock climbing, and weightlifting.