based on your experience how much of the vj do you feel comes from the glutes? hwo much from quads? how much from other muscles?
well i've always said vj is quad/calf/glute dominant, sure hamstrings are important, but the former muscle groups play a much larger role in vertical displacement.. quads/glute/calf are all equally important, i cant give a percentage or anything.. people downplay the calfs but really, the calf/achilles provides so much energy/force production at triple extension, for example, i can pogo hop pretty high which is hardly any knee bend, that is primarily a calf/quad/glute movement.
quads technically need to be the strongest because of the plant, if they are weak, you collapse in the plant.. so quad strength is major, generally they are easy to strengthen though so it's usually no one's concern.
at the end of my dunk sessions, i am nearly always achy in my quads/calfs, only rarely in my hamstrings..
other than that, powerful arm swing becomes important.. it can add alot to the jump by producing a stronger triple extension.
peace
EDIT: regardless, everything needs to be strong (explosively & reactively): quads, calfs, glutes, hamstrings, lats/ delts/ chest/ core