Freakonomics Radio Edit this Published in Freakonomics Radio by 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.