A recent client of mine was relatively healthy (blood pressure controlled by medication) and physically strong and fit for someone over age 80. He came to me at the request of his daughter. His goal was to improve his general fitness, and to fulfill a long-held dream to get back on his skis - a sport that he loved through much of his life.
Brandon Roy of the Portland Trail Blazers just retired due to ongoing knee problems. Given the stress that comes with years of running, jumping, twisting and sprinting, it is remarkable that more NBA stars do not suffer from the same fate, midway through or earlier in their careers.
At a young age, sport is about participating and creating the desire in each kid to return for the next season. Having fun and learning to compete at a young age are of primary importance. Winning should not be the goal, but for those individuals and teams who do win their efforts should be supported.