Surprised to so many people showering more than once per day. For people that do that, is that due to morning showers coupled with post-activity shower?
Yes. When I ride my bike to work, I shower when I get there. If I do yardwork, I shower when done. Before I go to bed, I shower or take a bath. Sometimes when I'm working from home and stuck on a problem, I'll take a shower to think about it.
When the summer rolls around that's not super uncommon for me. Go for a run in the morning - take a shower. Take a walk in the evening - take another shower. It gets hot n' humid in the Summer where I live though.
That second shower is pretty quick though. Just enough so that I'm not sweaty when I go to bed because who'd want that?
Hot summer day (35-40c) with time outside means that an extra shower to rinse off is very nice, and sometimes a third shower before bed to rinse off and get cool is comfortable. Usually that's excessive though.