 Complete the following phrase:  Schumacher was noted for pushing his car to the limit for sustained periods during races and a pioneering fitness regimen. He and his younger brother, Ralf, are the only siblings to win races in Formula One and the first siblings to finish first and second in the same race, a feat they repeated in four subsequent races. Over his career, Schumacher was involved in several controversial racing incidents. Twice, he was involved in collisions in the final race of a season that decided the title, first with Hill at the 1994 Australian Grand Prix and later with Jacques Villeneuve at the 