relation/transfer of training tests and 40 yard dash

I read sometime ago there was fine balance between air & ground flight to run your optimal 100? (I didn’t record the source). I’ve also found that the vertical jump deals mainly with knee extension and little with hip extension. A lot of conflicting information out there.

Do the guys excelling in the vert produce just too much air time?.

Dwain gaining significant BW would have certainly been a factor.

It doesn’t always have to be at the expense of gaining mass though.