This is great advice and even easier to do when working remote. I have a few free weights that I keep nearby and have worked out a short and simple routine that I don't mind doing. It takes about two songs to finish, so I guess 6-8 minutes. Any time I'm starting to lag or I'm stuck on a problem I walk over and do the routine, then come back to my desk much more alert.

One nice aspect of having one (or a few) regular routines is that it's easy to see progress. Even with just a few very short sessions most days I can lift much more weight than when I started.