%0 Journal Article %A James H O'Keefe %A Carl J Lavie %T Run for your life … at a comfortable speed and not too far %D 2013 %R 10.1136/heartjnl-2012-302886 %J Heart %P 516-519 %V 99 %N 8 %U https://heart.bmj.com/content/heartjnl/99/8/516.full.pdf