Sweat Den is the sauna spot your friend group won't shut up about. Tucked into the Pearl Street strip, this is where Denver goes to sweat out the week, whether that's after a brutal trail run or a rough Saturday night. Infrared heat, cold plunge, and a setup that makes recovery feel like a ritual instead of a chore. The space is small and intentional, not some sprawling spa trying to be everything. Regulars come for the heat, but they stay for the community feel. You'll see solo sweatpass sessions and small groups booking it out for a post-workout reset. If you're the type who takes wellness seriously but doesn't want it to feel clinical, this is your place. Book ahead, it fills up fast, especially on weekends when everyone's nursing something.