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Have a look at the treadmill here (updated version).

On another note

According to common belief, people tend to walk in circles when they get lost in for instance the desert or the jungle. This has been attributed to differences in leg length, causing people to walk in the direction of their shorter leg (Lund, 1930). Although quite some research has been done on the ability of people to walk blindfolded to a previously seen location (see e.g. Loomis et al., 1992), the most extensive study about walking for longer distances dates from 1928 and still didn’t include walking with vision in an unknown environment. In collaboration with the national German television channel WDR - Redaktion Kopfball, we decided to investigate whether people really walk in circles and what might be the cause(s) of this. What makes the question of special interest to our research is that here all factors that influence our walking behaviour come together: biomechanics (leg length, leg strength, other body asymmetries), perception (vision, vestibular system, subjective straight-ahead) and cognition (landmark use, cognitive strategies to find ones way, knowledge about environment, decision making).

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Kopfball extrem - Allein in der Wüste