Talking of strength and power, no sport needs that more than body building does. And most modern body builders dont eat red meat - mutton, beef and pork. In fact Monohar Aich, the second Indian to win the Mr Universe title in 1952, was a pure vegetarian. And I think so was Monotosh Roy, the 1951 winner.
Today our body builders are not "world class" because we have been left behind in technology - both training and steroid usage. But not because we dont eat beef.