Try walking further: calculate a loop of slightly longer than that and go for it. I’ve had a lot of fun doing exactly this as exercise in the last few years -

Try walking further: calculate a loop of slightly longer than that and go for it. I’ve had a lot of fun doing exactly this as exercise in the last few years - picking incrementally longer “loops” of distance and just fucking going for it with a bunch of water or Gatorade equivalents :) Caveat: may become addictive.