This is the start of my 4 weeks 100m sprint challenge. Training, dieting and recovering for 4 weeks to try and improve my 100m sprint time as musch as possible.
The current men's world record is 9.58 seconds, set by Jamaica's Usain Bolt in 2009, while the women's world record of 10.49 seconds set by American Florence Griffith-Joyner in 1988 remains unbroken.