Thus, the ball will have a greater horizontal velocity after the bounce than before the bounce. (scientificamerican.com)
Vertical force production and getting the knees parallel in front of the body is the most important component of getting fast (this allows the «validation» of floor - based weightroom work to this end, despite a lack of horizontal velocity). (blog.trainheroic.com)
It trains horizontal velocity, which dead weight just can not do. (sportstarsmag.com)