Ta kafa ta sirri mafi kyau ga Half Marathon na 1: 13: 03 a
2005 IAAF Gasar Rabin Marathon ta Duniya a Edmonton, Alberta, Kanada. Mafi kyawunta a cikin marathon ya zo ne a lokacin Nagano Marathon a 2006, tare da lokacin 2: 29:46. Rillstone ya kafa tarihi na kasa don tseren marathon a 2007 IAAF World Championships a Osaka, Japan, tare da lokacin 2: 33:58, ya gama a wuri na goma sha uku.