I’d like to try a regimen of short writing exercises for a few weeks, ideally doing at least one every day.
I have no problem with waking up early and my lunch breaks are needlessly long, so I can easily spend 20 minutes writing in the morning before leaving home, another 20 minutes during lunch break and 15 to 30 minutes in the evening, before going to bed.
On lucky days (when the train isn't too full or when I manage to snatch a sitting spot), I could also add to the schedule some kind of observation exercise.
What types of writing exercises are best suited for each environment (home, workplace, public transportation) and each part of the day ?
I also don’t know if it’s best to do 3 distinct extra-short exercises every day, or to choose one exercise per day, for example writing down whatever nonsense comes to my mind when waking up, then expand it and rewrite-it into something coherent during lunch and re-draft it again in the evening.
Note : The inclusion of other locations (parks, school, bars, libraries, etc.) or other times of the day (3 am, after-nap, etc.) into the answers you be greatly appreciated, as it would make them susceptible to help other people, with different life-styles and schedules.