54 Inches Box jumps March 28, 2021Sports and Fitness Videos Close × Breaking my personal best and overcoming the fear of jumping over a 50-54 inches box. I’ll definitely crash my balls if I fail to attempt the jump. Do not try this in the gym. source Related posts:5 Ab Exercises with Fat-burning Element![Level 3] 4 Minute Full Body Blaster![Level 4] Intensive Fat Burning Routine