Them fellas need to work harder. Compared to most of the other runners they lookin Magga
They need to eat more yam (Bolt father claim that is the secret) or drink the american juice.
Do some damn thing because what they doing ent working.
Every Olympics we keep saying "good job he/she make the finals, next time is......"
They preparing for 4 years to go on the stage and produce a final? Not good enough
Eat properly, sleep properly, train properly, be disciplined and always work on improving, anything less is ah final appearance at best.