The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

Tennis is a stop-and-go sport, often with moments of violent activity, requiring a sudden surge of heart action. It is a good sport for those in good physical condition who do suitable daily conditioning exercises, and who do not approach their limit of activity or endurance.
Tennis as a sport （） only for right people.