');document.writeln('

');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln('

');document.writeln(' $\"\"$ ');document.writeln('

');document.writeln('

What accounts for the recent fast performances and world records, especially among women runners?

');document.writeln('

');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln(' ');document.writeln('

	');document.writeln(' ');document.writeln(' Super shoes ');document.writeln('
	');document.writeln(' ');document.writeln(' Improved scientific training ');document.writeln('
	');document.writeln(' ');document.writeln(' Drugs ');document.writeln('
	');document.writeln(' ');document.writeln(' Natural progression ');document.writeln('

');document.writeln('

');document.writeln(' ');document.writeln('

');document.writeln('

');document.writeln(' View Stats

');document.writeln('