"Back in the day" I had a physical job. I hung from ropes in highly uncomfortable positions doing some pretty dangerous stuff. Often, every muscle clenched - from brow to sphincter. 65 feet up a tree with a chainsaw running, body twisted and getting ready to unleash big, dynamic forces, it was hard to be mindful.
At the end of a day like that, it was nice to go to a little neighborhood Hatha Yoga class where it felt like there was all the time in the world to settle into each position, check in with every muscle group and make sure all the non-essentials were relaxed, one by one. (And then all relaxed, shuffle across the street to have some great Japanese food and get a little tipsy on sake).