Fun look at the four drills Carlos Hyde is working on to improve his 40. He said he was "devastated" when he clocked the 4.66 at the NFL combine.

3. BELT SPRINTS

Once out of the blocks, “from the 10 to the 20 is key,” Hyde says. The goal is to retain as much of the forward body lean from the start as possible while thrusting arms and legs forward aggressively. To hone those moves, Hyde practices by pulling against a fixed object while maintaining proper form. Six sets of 30 seconds each.