theres a difference between like a box jump.. and jumping in high jump... highjump u go sideways ha aka the fosberry flop.. so by 6ft do u mean for high jump
my vertical is 30 inches. i kinda suck at jumping (for a volleyball player anyways) lol. my height makes up for it tho (i'm 6'2") so i can still snap the rim on a 10' bball net and such.