metsmarathon wrote: versus plant-and-throw, the jump throw looks to take an extra step longer, while making the throw itself longer, all while taking the fielder's momentum away from the throw, resulting in an expected lower throw velocity. about the only good thing the jump throw does is keep the ball in the air longer so that a weaker throw has a more favorable terminal ballistic profile. easier to catch and less likely to skip under a glove if it does come short. i'd love to see a real kinematics/bio-mechanics study on it. Well, talking speculatively, as kinematics/bio-mechanics is merely my hobby and not my profession, I think an advantage to the jump throw is that if the infielder plants his right/push-off leg, but fails to completely arrest his momentum, he has to turn his left/pointing leg toward the direction of his momentum to keep his body from collapsing. This necessitates yet another right/plant step in order to return to an executable throwing position. Jumping allows you to rotate your hips toward first, while your momentum is continuing to take you away toward the leftfield foul line, without having to negotiate that paradox on the ground until after your release. Acknowledging that, the disadvantages are obvious --- a lack of leg thrust and too much loft and air-resistance on your throw. But I know a still more excellent way, and that's the slide plant.