I am interested in improving my max box jump. I am currently at 38inchs. I train upper-body statics 3-4 days a week and add my leg work at the end of the routine. I was wondering what is the best way to go about improving my box jump. I am currently experimenting with using percentages of this number ( 55% x5 for warmups, then a set at 65, 75, and 85). So far its been giving me a pretty decent workout, I alternate box jump days with pistol days, and always finish up with some of coach sommers natural body curls.
A side note, performing the box jumps towards the end of my workout dosent really effect my ability to do them.