No stair climbing all week so in guilt so went up stairs at Block 3 on Sat 16 April on the way to supermarket. It was just before sundown at 7 in the evening so it was cool and the sky got more orange and dark with each set. 3 sets up and down.
After the 5th storey, the thigh muscles start to protest. What I found helpful was engaging the glutes a bit more so that it takes the load off the quads. Keeping posture upright, eyes looking straight ahead, legs limber, ignoring the inner voice which says this is stupid and should be banned!