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Become a Better Runner While Charging Your Smartphone

One little gadget helps your running—and your battery life.

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siva atom

Cycling is one of the best forms of cross-training runners can do. Time on a bike helps build strength and stamina while giving your body a break from pounding the pavement. One recent study from the U.K. found that runners who completed two weeks of twice weekly high-intensity interval sessions on a stationary bike were able to improve their times on a 3K run by an astounding 25 seconds.

And if you like to multitask, we just discovered one little device that helps you use all that energy to charge your smartphone while you’re working up a sweat.

The Siva Atom takes your pedaling power and helps you increase that little percentage at the top of your home screen.

Related: App Lets Runners Travel The World From Their Treadmill

According to the company, “The resistance is very small, and is proportional to how large your charging load is. At full generating capacity, it is akin to riding with your tires at 70 psi instead of 90 psi, or pedaling up a 0.3% grade. In our use around town, it is very difficult to tell that it’s on the bike.”

At $150, it’s an expensive charger. But we’ve been in desperate dead-phone situations where it could have come in handy. Would you invest?