Back to the grind

Yesterday my physio cleared me to start exercising again. I was to start with ten minutes of something running related, like running on a treadmill or stairclimbing but stop if the pain reached 3/10. If OK then I was to increase the amount by a couple of minutes each day. I've just done ten minutes of stair climbing. I'd put the pain at 1.5-2/10 so OK but not fantastic. Now I have to see how it bears up for the rest of the day.