Gadgets that link directly to apps to improve wellness

In this week's FT there was an article about products that interface with apps to monitor various aspects of wellness. The three products reviewed were: 

Jawbone UP (A combination of a wristband and iPhone® app that tracks your activity and sleep and "inspires you to move more, sleep better and eat smarter")

Fitbit widget (A "super sensitive 3-D motion sensor tracks your day down to details a pedometer can't catch, showing your exact steps taken, calories burned, and distance traveled")

BodyMedia FIT armband that (A system gives you "highly accurate information on activity, calories and sleep patterns"). 

I have used the company's own product descriptions. In my view this is going to be a big big market. I am not sure about the current generation of products but devices that directly interface with apps are going to be big business. I expect them to be popular with older consumers as aids to fight the ravages of ageing. Dick Stroud