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6 Tech Startups With a Fun Spin on Fitness Tech companies are taking the tedium out of training. Here are a few of our favorite digital fitness options.

By Jennifer Wang

Opinions expressed by Entrepreneur contributors are their own.

Lean Machines

The zombies are gaining on me. The wailing of the undead crescendos, then subsides as I put on a burst of speed that sends me out of the parking lot and onto the street. This time, I've escaped intact, but I likely haven't escaped judgment from the (living) people who can see me from their office windows, sprinting like a crazy person.

I'm Runner 5, about to clear my second mission in Zombies, Run!, an app from U.K.-based game-development agency Six to Start and writer Naomi Alderman, which has accomplished the improbable task of getting people to shell out money to go running. At $7.99 a pop (and with about 100,000 downloads sold in three months), that's no mean feat.