exeecise可數嗎

例句：

Exercise tones up your body.

運動強健身體。

Riding a bike is great exercise.

騎自行車是很好的'鍛鍊。

Swimming is good exercise.

游泳是有益的運動。

How often do you exercise?

你多長時間鍛鍊一次？

Swimming is a good form of exercise.

游泳是很好的鍛鍊方式。