resistance training and allow your whole body to be able to perfiorm at the same explosion rate as your core and legs.

Which is good, but you need something that can create the same explosion throughout all your muscles... Pool workouts.... swim after practice and run in the deep end of a pool, it'll build

Hey your football question... dude all that stuff they told you is great like the parachute and stuff.. but it's not adequate... Look a parachute will increase your leg and core strength