[superuser2]

Running? I wear loose-fitting athletic shorts; a phone swinging around in my pocket is really annoying. I'd have to get an armband.

[nradov]

Arm bands are cheap, much less than a smart watch.

[kalleboo]

I've had a very hard time finding an armband that fits around my arm, and fits an iPhone 6. They seem to all be designed for women.

[nradov]

Well you've found a new startup business opportunity: smartphone armbands for people with big arms. :-)