In case you missed it:
Eugene Half Week 1
Eugene Half Week 2
One of my favorite running podcasts as I've mentioned before is Pro Running News with Dave Lipman and Matt Fox; recently Matt Fox has also started doing his own separate podcast in addition to PRN called Sweat Elite (after his training/coaching company of the same name).
In general Sweat Elite doesn't speak to me in quite the same way as PRN, but every now and then there is an episode or two that piques my interest. Recently Matt has been doing a series called "Training Talk" which is more focused on the nuts and bolts and fiddly details of designing good training and how a well-designed training plan creates the physiological adaptations (ie., "fitness") that make for strong performance. This week I listened to episode six in the series, entitled How Fast Do You Lose Fitness?, in which Matt interviewed Max Frankel, one of the Sweat Elite coaches and in fact the coach who has actually been designing Matt Fox's own marathon training. (Historically, Matt was/is a pretty high level middle distance runner who I believe even ran for some Australian national teams in his younger days.)
Originally the episode was supposed to focus on a different topic but thanks to various Life Things, Matt had recently taken some unplanned days off from training, so instead they pivoted to discussing the role and impact of such unscheduled rest days. Ergo: How Fast Do You Lose Fitness?