Good topic jp. I'll throw one in for "it can be developed". College son also played basketball in HS. He is a short player who, at home, is always doing standing and running jumps in a vaulted entryway to see "how high" in an effort to "touch the rim". He's been doing this for years, never with particularly impressive results. This fall, the baseball program went heavy on box jumps. When he came home for the holidays, his standing jump really caught my attention. It was, for the first time, noticeably explosive.