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While exercise is good for your body, how would you like to exercise your finger to generate some power? Designers Song Teaho and Hyejin Lee recently came up with a concept battery that charges up when you twirl it around your finger. If you think you don’t need to carry around your laptop charger anymore because apparently your finger can do the trick, then you’re wrong because it takes approximately 130 twirls to give you around two minutes of talk time on your cellphone. That’s right, two minutes, and it’s about enough to get you through emergencies. Alternatively, you can also use a battery pack that can give you MUCH more power with much less effort.