Resumen de Runners' joints self-heal on the go
Ultramarathons do take a toll on a runner's body, breaking down cartilage and even shrinking the brain, but athletes seem to bounce back from both, with joints repairing before the race has even finished. For many, marathons represent the ultimate fitness challenge. But a minority go much further, taking part in ultramarathons like the Trans Europe Foot Race, covering 4500 kilometres from the south of Italy to Norway in 64 days
