exercise做锻炼可数吗

　　Swimming is a good form of exercise.

　　游泳是很好的锻炼方式。

　　I should exercise more.

　　我应该多锻炼。

　　Running on the spot is good exercise.

　　原地跑步是一种很好的锻炼。

　　Diet and exercise are equally important.

　　饮食和锻炼同样重要。

　　You shouldn't exercise on a full stomach.

　　你不应该吃饱了就运动。

　　Diet and exercise are obviously important.

　　显然，饮食和运动是重要的。