So, if you only have four minutes a day to physically change things up, consider very cold water immersion/showers. It has a major effect on mood (uplift), energy, and apparently, immune system.
Here is the re-cap of VCU School of Medicine's study. If you're feeling equanimous and yet have some
attention bouncing/residue, then standing in a cold shower for 4+ minutes is useful for putting the mental faculty to actual and sensate activities.
Even if you're feeling post-stream entry and wondering, "what to do with my time now?" this is fun and an invigorating way to see physical aversion transform into liveliness into a bodily treat of opening channels, mental willingness, felicity, plain old fun experience.
If anyone tries this for a few days, I would be keen to hear how it effects your day. I have found that the cardiovascular effects seem most pronounced and are greater than a jog (however, I am then quite energized for a jog later in the day). I experience quite a few lasting benefits for just 4-6 minutes in a cold shower or in a near-freezing (36.86'F) natural body of nearby water.
Here is a blog entry about it and the comments are interesting (e.g., abatement of Raynauds, CFS). The blog entry links to the NIH database wherein one can see studies on cold water exposure and non-lymphoid cancers, chronic heart failure, etc.
Good luck
edits for errors spelling, syntax
[EDIT: N A and C C C raise excellent concerns about the shock of cold water. Wim Hof recommends in his book Becoming the Iceman (location 4149 ebook) to start showers with warmer water and to gradually increase the cold water (decrease the hot water), to try not to shiver and to try not to gasp but to breath deeply through the nostrils (not inhaling water).
So everyone must be careful and responsible for themselves; a few days ago I read about how such cold immersion/showers may effect dyskinesia in Parkinson's Disease (PD). Though such a response may not be inherent (I know someone with PD who turns up the cold water and has not reported an increase in dyskinesia), an increase in dyskinesia may happen, particularly if the willing, colder shower is perceived as "painful".
My approach, mirroring Wim Hof's guidance, is to feel welcoming and relaxed during the experience. I am, after all choosing it, and it is not forced on me. I am simply using it to work with the mental faculty and affective assumptions. It is a luxury to be able to do this, IMO.