Why did you start to study the evolution of running and exercise? I got interested in how we hold our heads still when we run. It began when my colleagues and I were doing some experiments with pigs as models. It is very uncomfortable to watch a pig run: its head bobs all over the place. But animals that are good at running, like us, are extremely good at keeping the head still, because it is important for gaze stabilisation. We started thinking about humans and chimps, and came up with hypotheses about how we evolved head stabilisation to run.
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