100 x 400 metre intervals is insane.
Putting aside the extraordinary level of fitness needed, the mental strength required to complete such a session (especially as he must have done it on his own) is "off the scale". Can you imagine completing say 20 of those intervals, feeling the pain and then realising you've got another 80 to go !
Got to be the "toughest" runner of all time and always will be one of the all-time greats.
I agree with Birkmyre. A really great article and these Olympic related stories have been far and away the best thing in the magazine in recent months. I thought the ones on Kelly Holmes and John Carlos/Tommie Smith were also particularly good.