re: Good 40 time for 40 year old male?

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but wouldn't know why or how that would help anything in life.

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How or why? Because you might need to run somebody down or run away from someone.

For all those saying you shouldn't be doing that at 40, that is why the US is in the condition it is in. 40 yard dashbos my favorite conditioning tool and Imo is the best conditioning tool. Being able to truely Sprint at all out top speed should be a basic tenant of being in shape. It's a great tool for anyone and everyone unless they have a propensity to get injured. Very very functional exercise.

As far as a good time, should shoot for sub 4.8 but main thing is improve whatever time you have now.