Size, in and of itself, does not necessarily mean obesity and cannot be used as a predictor of agility or athleticism. There are people who are just plain large and muscular and who most of us here would not want to engage in a wrestling match if for no other reason than that their size far outclasses our own, no matter how fit any of us might be.
It is precisely for that reason that some sports are based on weight classes; in others, you have to compete with all athletes regardless of your size disadvantage.
Knowing what you can win in as a product of your innate characteristics is a key component of positioning oneself to win for the long term.
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Athletes know that they will have to sit on the sidelines while recuperating from some conditions - and while they sit it out, their former and hopefully future competitors will carry on. It is not at all uncommon for an athlete to not be able to return to a level of health and strength to compete as they once did.
Athletes also know that, as good as they may be today, they cannot rest on their laurels and expect to remain champions forever, no matter how many times they have been the champion in the past.
The world marches on and there are precious few examples of individuals or organizations that can manage to stay at the top of their game for the long term. Gaining advantage while one has it and adapting and re-resourcing is essential for those who want to prolong to the greatest degree possible their position at the top of the game.
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It is also true that some people and thus the organizations they lead create change, embrace and learn from change which others force upon them, and win as a result of their ability to adapt while others - and in reality the vast majority of humanity - follow, waiting for someone else to show them where to go, and are dragged along by a rapidly changing world.
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The former group of people and company are leaders....and the rest of the world tries to keep up with the leaders.