Body harnesses are often attached to the stomach area to allow people freedom of movement with their arms and legs. This type of harness is similar to what people use when they are climbing. Another type of harness is the shoulder, or arm, harness. However, this should not be used by itself. Doing so would put your full weight on your arms, which could lead to a shoulder dislocation or other arm injury. Along with fitting harnesses, professionals take steps to ensure a location is safe for jumping.