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LifeSpan made a standing desk bike that can charge your phone, if you've got the legs for it

Charge your phone while you pedal.

And, if you cycle at speeds over 60 rpm, you'll be able to produce 65 watts per hour, enough to put some decent charge in your laptop or USB battery pack. There's also a companion app which will let you track how much power you've generated, how many calories you've burned and even change the color of the embedded RGB light. Sitting with my laptop balanced on a tall cocktail table, I was able to maintain a fairly brisk typing speed all the while slowly adding some power to my phone.

Get the Android app