I was a bit apprehensive about this one because of the step up to 90 seconds, it's an extra 50% of running each time! But I managed it ok, I deliberately set off at a slower pace this time to accommodate for it and for the first few runs felt I probably could have gone on for longer, legs started to feel a bit like lead again though for the last few 90 second runs.
Really enjoying the sense of achievement I get after finishing each run so far