There's pretty much an app for everything these days (seriously, iBeer?). But luckily, for every useless time-suck, there's an app or device devoted to health and fitness. Here, six of the best gadgets for getting--and staying--fit.  

Athos

Measure accurate form and muscle performance with a tiny gadget that slips right into your compression shorts or top.

Rise

Get back on the healthy eating track post-holidays with an app that virtually pairs you with a nutritionist.

LumoBack

Improve your posture by strapping a thin band around your waist.

RockMyRun

Never fall victim to a boring workout playlist with the app that curates mixes based on your planned route.

Ampy

Get even more out of your run with a device that harnesses your kinetic energy to charge your phone.

Apple Health

Keep track of all of the information from your various health apps with one easy-to-use dashboard.

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