Some grew up in a family with a strong history of athletics: his father Some Muge was Kenya's first ever medallist at the IAAF World Cross Country Championships. He followed in his father's footsteps in distance running, as did his older brother Matthew Kisorio and younger brother Nicholas Kipchirchir Togom. Some made his international debut in 2008 at the age of seventeen and won his first medal by coming eighth in the junior race of the 2008 IAAF World Cross Country Championships, helping Kenya to the junior team title alongside his brother Kisorio. The following year he set a 10,000 metres track best of 28:10.8 minutes and took the bronze medal in that event at the 2009 African Junior Athletics Championships.