He was regarded as a pacy and skillful winger and also played for the All Blacks briefly until the emergence of Jonah Lomu effectively ended his All Blacks career. Lomu played a major role in the 2001 World Cup Sevens win, effectively filling in for Rush, who suffered a broken leg in New Zealand's last group match of that tournament.
Rush switched full-time to Rugby Sevens in 1999 to compete in the newly formed IRBinternational Sevens circuit. Rush helped NZ to win the first 6 versions of the World Sevens Series.
Over the course of 14 years, Rush regularly appeared for the New Zealand Sevens team at the Hong Kong Sevens and other Sevens tournaments, mostly as captain. In later years, he converted himself into a forward in the Sevens version, with the wing position given to his understudy Karl Te Nana.