Ten Minutes, Prescribed: Format, Frequency, Joint Load and Measurement for the Ten-Ten Protocol

WP-07 in the VAT-Trap / SCVC White Paper series. The practical companion to WP-06, which makes the case for ten minutes of hard interval work on a base of habitual walking but does not say how to do it. This paper covers what to actually prescribe: which session format, how often, on what equipment, at what intensity, and what to measure. Its organising principle is that a protocol whose entire claim is that it can be sustained for decades is destroyed by anything that interrupts it — and in middle age the commonest interruption is injury rather than lost motivation. The paper therefore gives most of its space to joint load. It sets out why impact is not the villain the intuition suggests (recreational runners have less hip and knee osteoarthritis than sedentary controls), why the real cost of downtime is measurable muscle loss and anabolic resistance within a fortnight, and how to choose a modality with the lowest probability of interrupting the habit — while noting that a protocol delivered entirely on low-impact equipment contains no osteogenic loading and the bone stimulus must be assigned elsewhere. Further sections address frequency as a daily default rather than a weekly target, the inadequacy of percentage-of-maximum-heart-rate intensity prescription, the benchmark hill as a field measure of fitness, safety and contraindications for near-maximal effort, and how far interval training can substitute for step counts in occupationally sedentary people — which it does for fitness and visceral fat, and does not for the independent risk of prolonged sitting. A downloadable HTML version is included alongside the PDF: its references are hyperlinked with superscript citations and return-links, making it easier to cite, search and link to specific sources.