Used to use my retired running shoes for gym. Couple of years ago bought a Puma Faas 250 just for gym. Recently got a Puma TX-3 .. tht I sometimes use for legs day.. then I've been eyeing Nike Flex Supreme TR3 since last year, but when I finally decided to buy the outlet didn't have my size... so I went to Studio R Pyramid & found it's cousin, the Nike Flex Run 2014 going at 30% off. The rest is history...