Yoga, wife does it, which I, well, will not complain about, enough said about that!!!
It had been suggested that I should attend the beginner morning class (5 am).
Main concern is the amount of possible gas that could be expelled at that hour, with all that added activity, enough said about that!!!
I personally like to walk out to the shop (shed), coffee in hand, click on the radio, stretch, moan, fart, lick yesterday's wounds and progress into the day.
All kidding aside, I think stretching is one of the keys to a good healthy day. Look at videos of the shipyards overseas 30 years ago, every shift started with a stretching time.
I didn't see that at least in my location (USA) till about 15 years ago, and then some of the crew, not all, rolled eyes in back of head.
I stretch every day and all day, seems to not only help my physical part but also stimulates the brain too.
One of the best hard hat stickers from Kiewit,
"Never to tough for safety"