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Sure, there are valid reasons to go running in the gym. TubularTittyFrog also mentioned daylight and weather. But I see too many people running in my gym during sunny days and the gym is 100m away from a forrest on one side and 300m from a park on the other side. So why not go for a run outside and return to the studio for the next round of weight training.

There are also cardio options in the studio I do understand: Cross trainer and rowing machine for example. Not everyone has their own rowing boat. But running indoors right next to a perfectly fine outdoor opportunity I won’t understand. I don’t say it’s stupid, I just don’t get it.

Is a great explanation except for those people I see there durung the day in perfectly fine weather.

I never understood why people go to studios to do cardio. Just take your bike or your running shoes and go for the park. So much better for psyche and purse than paying 40€ a month to run in a stifling room looking at a gray wall.

Better to combine both things: Run to the studio, do strength training there and run back home.