The ability of an exercise to improve strength is not dependent only on the weight of the implement but also on the amount of force required to move it through a given range of motion. Just as more force can be produced during a lighter but faster power clean than a slower and heavier dead lift, so too more force can be produced with a lighter KB (approx. 30% of user's body weight according to force plate studies) than with a heavier KB. A KB swing is also an example of a weighted exercise in which the implement does not travel in a straight line.