Just Jump Mat
The Just Jump System is an example of an electrical contact operated system. The Just Jump Mat is a 27 inch x 27 inch mat with a hand-held battery operated computer unit. The mat calculates vertical jump height by measuring the time that the feet are not in contact with the mat, and from this calculates explosive leg power. The hand-held computer displays height, and hang time for 1 jump, average height plus ground time for 4 jumps, computes explosive leg power rating, times sprints and foot quickness.