I decided to try wearing an old pair of Mizuno Phantom Racers for initially a week, to see how they fared with regard to what the book said about lighter shoes.
I ran 3-6 miles per day for 6 days a week over varying speeds. I'm 5ft 10in and14 stones, so no lightweight.
No difference, so I ran for another week then it ended up as a month, then another and another ending up wearing the Mizunos for training for three months. No injuries and bar a bit of stiffness, no difference. I admit I was very pleasantly surprised.
Edited: 01/09/2012 at 08:31