If you are participating in a marathon it might be a good idea to hold back a little in the beginning. Few can run full-out for 26 miles. There are times when it is best to be safe and keep a little in reserve.
If you are out to win a sprint or are out to set a record in the high vault then a different strategy may be in order. It would make little sense to hold back when jumping a deep ravine or running for your life.
The same is true in our personal and business lives. I think most people's default strategy is to hold back and play it safe. Be sure which type of strategy will bring about the results you desire. Sure, you don't want to burn out 5 miles into a long race, but you damn sure don't want to hold back a little and be six inches short of making the jump across a ravine.
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