My phantom chrome M100's are to blingy for the gym. They are also a wee bit heavy on the head.
So why do I continue using them at the gym? Well, I guess I like bling lol. More importantly though, they are quite comfortable, they isolate very well, the bass is outstanding, and they generally sound awesome.
Fwiw, I'm listening to the M100's off of my Galaxy S5 (and UAPP app) and Zuperdac. Really nice synergy.