I do two sets of strength training exercises every time I go to the bathroom. I alternate upper body and lower body exercises every other day. My favorites are incline pushups and tricep dips using the bathroom vanity. Lower body favorites are squats, lateral lunges, single leg squats, and standing leg lifts. I also spend half my day (afternoons) at a standing work station at work. It helps with back pain and I avoid the afternoon slump.
No equipment needed and you hardly break a sweat. Three trips to the bathroom a day is your 10 minutes and you didn't have to carve out any time to do it or even change into your gym clothes!