In this episode we talked with the physical therapist Richard Willy. Rich explains what tissue capacity is, what he looks for during a gait analysis, the benefits and pitfalls of 'wearables', and how footwear may fit into the whole picture. He also summarised the key differences between treadmill and overground running, with good take homes for clinicians who analyse their athletes on the treadmill and then extrapolate that to the outside world.