 He jokingly made a small wager with friends over whether he could manage the steeplechase but he efforts resulted in a recommendation from a coach, he said that he had a gift for the event and should specialise in it.His first international medal came at the 2007 African Junior Championships in Athletics, where he took the 3000 metres steeplechase silver medal behind Abel Mutai.Mutai noted that Jarso represented a challenge to Kenyan dominance of the event