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I've been doing a lot of run-walk-run as rehab - my cardio and leg strength has precluded any sustained pace, and plodding is exacerbates a rubbish knee.
I've been doing a lot of stringing together short, faster-paced runs, interspersed with walking recovery.
When I was fit, though, and doing mass-start events, I'd still walk through watering stations, as necking water / cooling down, had much higher priority than the <1 second I'd be losing.
Nice one. The section from Hal Higdon on the value of walking breaks has stuck in my mind since I read it last year. I use walking breaks all the time during my runs now. Makes longer efforts almost enjoyable. :)
If it is good enough for them...!