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i've heard of martial arts masters doing lots of pushups and situps and it seemed to work for them. For sprinting it probably is possible cause you arent trying to constatly train your muscles to grow. If you are doing that many pushups and situps it must also be a great cardiovascular workout. For sprinters in the olden days i can see how this could be true. Just like in boxing boxers where told for the longest time that to work out would slow them down and make them less effective.
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