50 lengths of 18 metre pool breast stroke in 32 minutes. Fast running through water, treading water, star jumps, in deep water, 2 lengths front crawl, fast, 2 lengths back stroke. Then floating gently in the empty pool to recover, imagining I was in the sea, somewhere warm. Total time in water 45 mins. Definitely met the physio requirement to increase intensity.
Inspired completed exercise for day by modifying supermarket stroll with trolley into alternating 1 minute stroll with 1 minute fast walk. I remember this method from my fitter days running it is called, I kid you not, fartlek. Did this for ten minutes.
Yes I am exposing myself to your toilet humour comments on the supermarket stuff, but I am well chuffed with my efforts.