@article{ref1,
title="Preseason conditioning exercises for high school football players",
journal="Minnesota medicine",
year="1967",
author="Henderson, E. D. and Erickson, Darin J.",
volume="50",
number="8",
pages="1263-1271",
abstract="<p>[Abstract unavailable]  Keywords: American football; </p> <p>Language: en</p>",
language="en",
issn="0026-556X",
doi="",
url="http://dx.doi.org/"
}