Planking For Your Muscles AND Brain! - LIVESTRONG.COM Reviews Stealth Core Trainer

10 High-Tech Health Tools to Try This Year

Stealth uses your core strength to control the action on your mobile phone screen, making static exercises like the plank more engaging — for your muscles and your brain. Want to up your motivation even more? Challenge a friend with multi-player mode. Like every other gadget, though, it doesn't work unless you do.

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