There's always soccer.

I played all throughout high school and it was a great way to build up to the wrestling season. Somewhere during the years I played soccer, a coach told me that in an average game, a player can run as much as 5 miles worth on the field. And a majority of that will be the short explosive sprints. Plus (believe it or not), soccer is a pretty physical and competitive game. Don't believe me? You should have seen Wichita Heights, Shawnee Mission West, and St. Thomas Aquinas last year. There were some big boys on their teams and a lot of them had hitting power that would make some football coaches' mouths water.

Also, it can be a fun game. You get some good exercise and conditioning in while at the same time having fun.