What's the best way to stay active at a desk job?

I set a timer to work for about 50 minutes and then an automatic timer for a 15 minute break. I use that time to go for a walk around the building, or up and down the stairs to get my blood flowing a bit. It also helps a ton with productivity and reducing stress.

I work remotely, but I think doing active pauses is a good way to stay active. One or twice a day, I get up, stretch, maybe walk around a bit to get blood circulating more, and drink some water.