http://www.youtube.com/watch?v=6I5UoWITbos"To run a 19.3, he’s going to have to run the curve a lot better, he’s going to have to hold that speed for a very, very long time,” Johnson said. “That’s not the most easy thing to do, even for him.”
Chances are, Johnson was spot-on with his assessment – even though Bolt went out hours later and broke Johnson’s record when he covered 200 meters in 19.30 seconds. Bolt can improve his speed on the curve, which will only fuel his astonishing progression.
At 6-foot-5, Bolt has defied conventional wisdom that he was too tall for the 100. He has learned to burst out of the starting blocks as fast as the smaller and more compact sprinters, and his long stride gives him a sizable advantage. He needs only 40 to 41 strides to cover 100 meters whereas most 100-meter sprinters need 46 to 47 strides.
He’s been able to take the long stride he has and been able to coordinate that and achieve a very long stride,” Johnson said before the 200 final. “That combination is deadly, as the people in (the 100 final) found out.”
http://sports.yahoo.com/olympics/beijing/track_field/news?slug=jo-200meterbolt082008&prov=yhoo&type=lgns