Why the Kenyans (Kalenjin) are so fast

If you are still wondering why the Kalenjins, a minority tribe in Kenya, have a disproportionately large share of the world running medals [1], this photo which appeared in Feb 23's Star (Lifestyle, page 3) offers a tantalizing clue. The pix which showed Masai warriors aiming arrows at the  Kalenjin was captioned "Masai-Kalenjins tribal war".

[1] T. D. Noakes, "Lores of Running", Ch 6.3 Africa's Running Experts.