AITA for exercising during our camping trip?

Last week I was on a canoe trip with a group of friends. We paddled 15 miles then camped. In the evening, after dinner when we were hanging out around the campfire, I did my usual yoga and workout routine, while still participating in the conversations.

Someone in the group asked why I was doing it. I responded that it’s part of my routine and by body yells at me if I don’t and that I am not used to being so sedentary. I work outdoors and being seated all day didn’t feel good.

The person who asked responded in an angry tone “gee I’m so sorry.”

I’m very confused by her response. Why was she so angry with me?