Returning to the grass track of his youth, he stepped in a hole and injured his hip, though it has recovered.

WSJ: Menu

Roger Black, who won silver in the 400 meters at the Atlanta Games in 1996, was part of a coterie of top-notch British runners who trained on a grass track at the University of Southampton.

WSJ: Menu

On top of this base sits the open air stadium with its artificial running track and grass pitch laid above the concrete roof of the car park.

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Old carriage houses and other traditional driveways of the past would often have strips of grass in between the track areas, or their designs would include naturally permeable materials, like crushed stone.

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Rosberg's new teammate Lewis Hamilton was back in 10th, as the 2008 world champion managed to complete the session despite hitting a barrier -- extricating himself from the grass as he tentatively reversed back onto the track.

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Crossing the great Atrato swamp, where the track became a causeway over slimy logs and then a mat of floating grass, the bike would sometimes sink into nothingness.

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