It seems that there is always some discussion going on about the rest days in the programme. Some people want to know if they are necessary; others choose alternate activities. There are certainly lots of options out there, like the NHS "Strength & Flex" podcasts!
When I made my way through the programme, I used a six day week, running every other day. It was hard to wait at times, especially when I was excited and eager to move on to the next run. Even so, I divided my time into "rest days" and "run days". Since graduation, I have tried to keep to that schedule as well.
When I am at home, I alternate on a two day cycle between running ~5km one day and swimming 2km on the next day. So my "rest day" is actually a "swim day".
Just for fun, I am curious to know: What do YOU do on your rest day? Swim? Cycle? "Strength & Flex"? Rest?