I recently added 10 minutes to the end of most of my workouts. This lets me get the effect of another workout without having the overhead. In 10 minutes, you can burn close to 100 calories, and in a week, that would be 500. I can’t think of an easier way to do that, but that’s only because I already have these workouts on my schedule.
The same thing could be applied to other things, but probably it’s not as quantifiable. I could code for 10 more minutes after I’m done coding, but when I’m done, I’m usually spent. The same goes for writing. This makes me think my workouts aren’t taxing enough. Maybe the 10 extra minutes will change that.