I have found two easy workarounds for this weird oversight on the collective part of Apple and Nike:

1. Start and pause the podcast of interest, and choose “Now Playing” before starting your workout.

2. Create a smart playlist in iTunes called “Podcasts” with the following criteria: Kind->is->MPEG audio file; Podcast->is true; and make sure it updates live and that all the rules you created must be followed. This will create a playlist with all of your audio podcasts that is navigable in the Nike+iPod mode during a workout, and you can flip through them on the go. (In order for this to work, the shuffle mode must be set to Off.) You can also add criteria, for example, that will specify that only new podcasts be added, or only those that are more than a week old, or those that were downloaded within the last 48 hours.

Stick with #2. Much more convenient with a very easy setup. Ensures maximum Radio Lab exposure without stoppage.

Cue A calling me a nerd. Anyone else have creative solutions for getting your podcast fill?