For quick feet and pivot speed, there's no better tool than an agility ladder. Lay it out and high-step through — one foot at a time, side to side, or hopping with both feet. 

The SKLZ Elevation Ladder designed the first must-have upgrade to this core gym equipment — plastic rungs that can be raised up 4 inches, forcing you to elevate your knees, raise your heart rate, and get more out of your workout. It may not sound like a lot, but after a few rounds through, across, and over the ladder, your feet start dragging. The ladder doesn't allow you to cheat yourself; every last step must be a high step. You'll benefit on the tennis court, the soccer field, and the obstacle race.

The ladder measures 6 1/4 feet long and 26 inches wide; a carrying case is included. [$50; sklz.com]