short distance speed tells you how much power a person can generate.
basic physics.
F=ma
speed over a short distance tells you more about that powerful running burst than a bench press or nrl highlights youtube clip will.
I'm talking more about power as it relates to colliding with another heavy athlete on a football field than the physics terminology (and I thought Power = Force times Velocity). Really a mix of explosive physical strength at various points of the lower and upper body, as well as balance, timing and footwork/technique.
As backward as rugby league is compared to everything in America, even league coaches understand there is a certain type of strength that can't be measured in the gym. Hayne's running game is one such example.
and gurminga, no one is death riding him. just not getting caught up in the hoopla of thinking hayne is better than he is. if he were jumping ship to super rugby I'd be saying he would be a bigger influence than Israel Folau has been.
But who thinks Hayne is better than he is? He is simply a 27 year old with zero American football experience who has attracted attention from multiple NFL teams. He must have impressed with his physicality. There is no other explanation.