score:3
More likely it was a group that happens to go to a mall to walk, as well as other events.
For example, you can look in a city on meetup.com for social groups. I've joined a few in Vancouver.
Several of them will advertise walks - be it around the waterfront, a hike, or quite likely indoors.
Indeed, a google search will reveal a few - for example, this Mall Walking meetup with VegasHikers.
Upvote:5
There are absolutely groups whose primary purpose is to meet up at malls and walk. Google has this information: here are some examples: