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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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juanito
https://training4endurance.co.uk/running/
I've used the 10k advanced one before, and knocked a couple of minutes off my 10k time, 36.26 from 38.30 or so. Pretty heavy going, but there are less strenuous examples there