So the East Africans have an amazing closing speed at the end of 5Ks and 10Ks. A guy like Martin Lel can also unbelievably kick hard at the end of a marathon. Can anyone tell me how fast do these world-class East Africans typically close the final lap in a 5K and 10K? Along with that, can you also tell me their typical 400m PRs (what they would run for 400ms on full rest)?