The best for a quick reset is juggling (believe it or not!). Nothing beats physical exercise, either at the gym, cardio alone or team sports, to make up for hours of sitting and staring at a screen.
partner juggling is a thing! I picked up juggling a bit ago, as my romantic partner is an avid practitioner. spent a half hour after work working on a 3-club Cascade.
One of the beautiful bits is, if you're working on something new, there's only so long you can spend attempting to "get it" before your brain fuzzes out and it becomes futile, and hence forces a break. A physically and mentally time-bound activity, unlike a lot of things one might choose to distract oneself with (social media, reading the news, etc)
As an added bonus lifting weights, especially pulling movements like rows and deadlifts, can go a long way toward correcting the hunched forward posture many of us end up in at the computer. Also there’s this: https://blog.frontiersin.org/2018/06/07/neuroscience-leg-exe...
Leg day is very important! I've recently taken up exercises to fix the effects of contracted hip flexors (planks, leg raises, etc) and have seen my posture improve significantly. Yin yoga is equally great for stretching the chest muscles that are so often tight due to forward hunching. Anyway, an article on its own :)
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