Sprinters can run long distance and have stamina. Many distance runners can also spring. Both generally do a fair amount of weight training these days.
The bottom line - be in the best all around shape you possibly can. Speed, strength and endurance is all important in defending yourself.....not to mention brains and experience.
There's a reason why the Army doesn't recruit old fat guys. And, there's a reason why special forces don't take low-scoring aptitude recruits.
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