Did 3 miles on a treadmill. I find that I'm able to watch my iPad while running. Right now I'm going through the entire X-Files series as I run. Walk. Plod slowly. Whatever.
I got a good sweat going but didn't push too hard. I'm happy with it.
Side note - I have a Fitbit Surge, but there is something wrong with the charging port. It won't charge at all. The good news is that it is within warranty, and they are sending me a new one. It should get here early next week. So while I have to wait, I'm going to be happy to have more information again about what my calorie output is.
But until then, I'll just have to enter exercise manually.