Today we're talking about the Yasso 800's developed by a guy named Bart Yasso. 

I was lucky enough to meet him after he gave a talk before the Salt Lake City marathon back when I was in residency about 20 years ago.

In any event, this workout is a useful way to analyze your fitness and determine your marathon pace. Yasso 800's can be really helpful to an injured runner who's returning to running when trying to figure out how fast you should run your post-injury marathon. 

Today on the Doc On The Run Podcast we're talking about how to use the Yasso 800s to test your marathon fitness after you've recovered from a running injury.