Almost all of us foam-roll the ITB and tell clients it's tight. Here's a richer picture, built from the anatomy: the ITB is a thickening of the fascia that wraps your whole thigh, it behaves as both tendon and ligament, it helps stabilise and lock your knee, and it backs up your ACL, contributing an estimated 13 to 40 percent of the resistance to your shin sliding forward. Which raises an awkward question about trying to make it loose. Plus the structure that matters even more for side-to-side knee stability. First in a series on the muscles you think you know.

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