The hex bar is a superior tool for performing squat jumps. A study published in 2011 in the Journal of Strength and Conditioning Research found that the biomechanics of a hex bar jump more closely resemble the jumping that occurs in sports.

With a hex bar you can jump higher and produce greater force and power than you can with a straight bar. As a bonus, the hex bar jump will also develop the traps as you shrug during the jump.