he had to do it anyway, even if it meant doing the jump barefoot. At the same time, everyone was required to have knowledge of their own limits. Respecting one's health and physical well-being was one of the foundations of the group. If any member hurt himself during or after the execution of a movement, the movement was deemed a failure. A movement executed only once was not considered an achievement; only with repetition was the challenge complete. Every movement had to be repeated at least ten times in a row without the traceur having to push his limits or sustaining any injury. If any mistake was made by any traceur in the group everyone had to start all over again. Humility was an important principle. No traceur was allowed to feel superior over someone else, for example by executing a movement only to show off in front of someone who could not perform the movement. If any traceur in the group claimed that he had completed a difficult and dangerous challenge that should not be attempted unaided, he had to prove his claims by doing the challenge again. Anyone who lied violated the principle of humility. Despite the huge emphasis on the collective, each traceur had to progress and develop independently, and there was a complete trust within the group. Every traceur was to encourage the others and show confidence through their behaviour. If a member violated the principles, the group could meet without the offending person to discuss various punishments. Anyone deemed unsuitable could be temporarily or even permanently banned from the group in order to uphold the disciplines, values, and principles. Despite the huge emphasis on the collective and the principles, everyone was trying to find their own way in Parkour to fulfill their personal development. The aim of parkour was to create the means to be yourself. In the late 1990s, after David's brother sent pictures and video to a French TV programme, the popularity of parkour began to increase. A series of television programmes in various countries subsequently featured video footage of the group, and as the popularity increased, they began to get more and more offers. Eventually, the original group split apart to pursue different goals, some staying with the discipline and others leaving. The number of practitioners in total, though, kept increasing, and parkour's popularity began to spread around the globe through television,