I used to work out at the gym attached to San Francisco's Four Seasons. That's where a lot of visiting teams stayed and they'd also come down to the gym.
The strangest thing I ever saw was a bunch of athletes and their trainers come down to the gym late at night, 9/10pm, and do an extremely easy workout. Like, one guy was just walking slowly on a treadmill while the trainer monitored him.
I'm assuming they'd just gotten in to town. I say this was strange just because it seemed like such a small detail for the trainers to be involved in. And it says something about the level of detail and discipline that NBA players are starting to adopt. I'm not even sure what the goal was--maybe just staying loose?