Pavel and Christopher Sommer as guests on Tim Ferris. Haven't heard any of his other podcasts but those are the best strength training related interviews I've listened to over the last 2 years or so. The Sommer interview is in 2 bits, so you'll have 3 hours worth there. Chuck a kb in the boot and blast out 50 swings every 30 minutes, to keep the theme going.
The funniest, sharpest comedy in the world is The News Quiz, a long running BBC political satire of the week's news. Recent episodes are downloadable but not sure about that if you are not in the uk.
And staying with the BBC , a long running interview series Desert Island discs will never be bettered. Fascinating guests from all walks of life. My favourite ones.....and they will make you cry, they will make you stop what you are doing and be mesmerised is Commander Chris Hadfield, the tweeting space oddity astronaut and David Nott, a specialist trauma surgeon who takes unpaid leave and goes off to war zones to offer his expertise, most recently in Aleppo, Syria. You will need to pull your car over. Your journey time may increase. If there is one interview you should do your utmost to get by any means you can it is this one.