Edit this Published in Freakonomics Radio What’s the “Best” Exercise? Listen 15 min Queue Download this audio Want to embed this player? Use the code below. More info. <iframe frameborder="0" scrolling="no" height="130" width="100%" src="https://www.wnyc.org/widgets/ondemand_player/wnyc/#file=/audio/json/339190/&share=1"></iframe> Share on Facebook Share on Twitter Email a Friend Most people blame lack of time for being out of shape. So maybe the solution is to exercise more efficiently.