I guess the point might also just be that Zhao Yunlan cares enough about his fitness to own specific running gear, instead of Da Qing, who jogs in his plainclothes.

OMG. I seriously can't imagine Zhao Yunlan going jogging on the regular. We never see him do it again, either - and would Da Qing really let him drag him along if it was a regular occurrence?

(I mean, he owns all that exercise equipment, too, but honestly, I think he's more likely to play around with it while drunk than actually follow any kind of exercise regimen ...)