Today’s Daf Yomi pages, Eruvin 42 and 43, kick things off with a sporting discussion about counting steps to properly mark an eruv. Little did the ancient rabbis know, but step-counting would soon become the basis for a multi-million dollar industry of workout apps and gadgets, from the Fitbit to the Peloton bike. But while these gizmos help you keep off the pounds, they also speak in a language that is often, well, religious. How is the rabbis' workout philosophy different from the one currently on offer? Listen and find out.