This dude is in perfect condition when it's at night, cloudy or slightly darkened, the temperature is around 14 to 24 degrees and it's raining a little. You can further optimize his well-being by serving him ice-cold, sparkling water, a mixture of Club Mate and Ginger Ale or an old Single Malt.
The most important thing is that you put him in front of a computer of his choice. If this is not possible for the moment, he is as well satisfied with activities in nature like camping, hiking, biking or climbing.

The worst things you can ask of him are eating/smelling rhubarb, watching football, getting near or attending bawling crowds and watching easily digestible TV shows or German dramas. Never ever blind him with a pocket torch or other bright lights.