We've talked about the dangers of sitting all day many times before. Standing desks and walking desks are good solutions, but if you want to use gadgets on your elliptical, bicycle, or other exercise equipment, the SurfShelf does it well.
The SurfShelf is a polycarbonate tray that attaches to any piece of exercise equipment to create a shelf to hold your laptop or tablet. Installation is easy, and while not permanent, it's quite stable (though not easy to move from one machine to another). The specifications say it can hold up to 27 kilograms, but you might not want to put a high end Retina MacBook Pro on it due to potential damage by water or sweat.
You can fit any laptop or tablet on the shelf and it will be held securely in place while you walk or run. Typing can be a bit awkward depending on how fast you are going or how much you are sweating, but scrolling through social media, your morning email or your news feeds is probably doable — as is watching streaming video. The video above is a tad cheesy, but does a good job of showing how it hooks up.
I've had the SurfShelf for over a year and it's really changed my life. I get a decent 45 minute to an hour workout on my elliptical and the support from the company was phenomenal when I had a problem. In theory, you could make this yourself, — which might be preferable if you're averse to the price tag — but for me, it was a small price to pay for peace of mind of good engineering and not seeing my device crash to the floor. Hit the link to check it out.
SurfShelf ($39) [Amazon]