BERLIN (Reuters) – Since Usain Bolt took 11 hundredths of a second of both his 100 and 200m world records at the world championships everyone has been wondering just how low he can go.

Now, the biomechanical breakdown of both races has been released and it makes incredible reading.
En route to his 200m record of 19.19 seconds Bolt ran the first half of the final in 9.92 seconds.
Michael Johnson, whose 19.32 record from the Atlanta Olympics Bolt broke with his 19.30 in Beijing, described the first half of Thursday's race as unbelievable.
“No one has ever run a bend like this and probably never will,” Johnson said. “This is the most incredible bend ever.”
Bolt's second 100 was timed at 9.27 seconds - and he said he was tired and that it was “not a great race.”
In the 100, where he clocked 9.58, he belied his own talk of being a slow starter by reaching the 20 meter mark in 2.89 seconds - fastest in the field and three hundredths ahead of Tyson Gay, known to be explosive from the blocks.
In the 100 the Jamaican reached a top speed of 12.35 meters per second, almost 28 miles per hour, and took 40.92 steps compared with the 45.94 of second-placed Gay, whose 9.71 was the third-fastest 100m ever.
Bolt is due to run again on Saturday in the 4x100metres relay final when Jamaica will look to add the world title to the Olympic title they won in world record time last year.
Their chances of gold increased hugely late on Friday with the disqualification of chief rivals the United States for an illegal changeover.