N'egwuregwu Olimpik nke afọ 2008 na Beijing, McGrath ruru eru n'òtù egwuregwu Canada nke ugboro abụọ ya, dịka onye gbara afọ iri atọ na abụọ, n'egwuregwu cross-country nke ụmụ nwoke
agbụrụ site n'inweta otu n'ime mba atọ ndị dịnụ site na Canadian Cycling Association na Union Cycliste Internationale, dabere na arụmọrụ ya kachasị mma na usoro World Cup, World Championships, na Mountain Biking World Series. McGrath enweghi ike ịsọ mpi na arụmọrụ dị egwu sitere na Athens, ebe ọ tara ahụhụ site na taya taya wee gbaa gburugburu gburugburu mpaghara teknụzụ iji dochie taya taya ahụ. N'ịghọta na wiil ọhụrụ ya nwere obere mmiri na-agbapụta n'ebe a họpụtara, McGrath kpebiri ịkwụsị njem ya mgbe ọ fọdụrụ nanị sekit atọ, o wee nọrọ n'ọnọdụ nke iri anọ na anọ.