>> If you try to get better endurance most of your training should be aerobic (instead of anaerobic)
>It's actually the opposite and interval training (mixed aerobic and anaerobic) seems to be more effective.
Wrong and easy to prove that its wrong, just look at a training regiment of any elite runner in any distance. Most coaches agree that 80% percent of your volume should be easy aerobic for any goal. Doing high intensity without a well developed aerobic base means you will hit a plateau with your performance sooner or later.
>Running without shoes (or barefoot-shoes) is probably even better once you have adapted to it.
The Born to Run fad has been over for years now. Consensus is incorporating barefoot running into your training makes little difference to performance except you'll probably injure yourself if you're not careful.
I've been walking in barefoot shoes for 2 years now and I've gotten tremendous benefits, but running serious mileage in them is a completely different story. Unless you want to get better at barefoot running, it's not useful.
Again, if it was useful at all you would be seeing professional athletes doing it. The most they do is some barefoot strides on the grass by the track.