First thing: if you have to wear gloves as part of a straight job, take them off every chance you can, just air them out.
Second: I stretch my fingers, elbows, and probably more importantly, my arms, shoulders, and backs pretty religiously.
That's my secret weapon -- really combats day-to-day stress, loosens you up, gets your core/upper-body in shape to sit down for a number of full sessions a day.
No, jokers, I'm not talking about some Schumann finger stretcher, just carefully working all the elements. Takes five minutes, but I repeat it at least a few times a day.
Aside from that, just scales either from the Czerny Op. 740 (ones he cribbed straight from Beethoven), or a few select passages from Beethoven. Or other passage-work from others.
Unfortunately, even though the Bach Sinfonias are part of my daily routine (I don't do them all, every day, but eventually I work through once a week or so), they aren't IMHO ideal for just relaxing tension -- even if they're not the most demanding music, they take some doing.
OH -- hey, just hand-drumming (LIGHT touch) to....I don't know like Clyde Stubblefield with James Brown.
That keeps you loose, I guarantee it, even if James Brown is a little "uptight." Substitute any other kind of simple pop music -- second-line New Orleans stuff.
Anything that works the kinks out does it for me -- plus basic relaxed posture IRL and some careful but still productive stretches.
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And, of course, just BREATHING while playing your basic repertoire routine -- that was a huge lesson for me that helped a lot.
I know some internet know-it-all guru is going to link to some book, but all I know is what I do.