It's true that you can really hurt yourself if you are running in the wrong shoes for your feet and stride.
Now there's a pair of running shoes that are fitted with sensors and gives you feedback on your running style and how you can improve it. Along with GPS tracking, it has an accelerometer that collects info on your running technique and feeds it back to an app on your phone through bluetooth.
After it starts tracking your running patterns, get ready for the cool part - because your shoes will start offering advice on how you can improve your running style. It may suggest a change in the way you position your feet or that you need to run on a softer surface.
The only thing it can't do is force you to get off your couch and run in the first place.
A former Nasa scientist has created the ultimate Christmas sweater for smartphone fans-- it features a 'live' flickering log fire.
Mark Rober spent nine years working on Nasa's Curiosity Rover, but he has quit that job to design and sell unique fashion items.
His latest line of knitted festive sweaters feature a small pouch at the front of each jumper, which can hold a smartphone.
A free app displays a flickering fire on the screen of the phone to give the appearance of real logs burning, which can be displayed in the knitted fireplace.