busymon - tool to force computer breaks

I had need of a tool to remind me (forcefully) to get off the computer and get up and walk around for a while. I was surprised I couldn't find anything simple to do this; I came across rsibreak but it looked like a mess to compile (i mean, cmake, obviously). I looked a bit more but nothing looked simple.

So here's a basic computer monitor that tells you off if you're at the computer too long - as a proxy for sitting.

As usual busymon has a software page and a repository.

In short my bicycle accident has lead to further complications, possibly in part due to sitting down for too long infront of my computer. So now i'm riddled with clots (some poetic license) and on blood thinners and should probably try not to make it worse. Hourly walking breaks are now doctors orders, and well, time just flies sometimes.