This dialogue is talking about height – if you ever travel around China you might be asked this quite a lot.
小明：王刚，好久不见，你看起来长高了。
你多高？
王刚：小明，我现在180厘米。
暑假锻炼身体，每天游泳，可能长高了。
小明：一定是的，锻炼身体太有帮助了。
王刚：小明，你现在多高？
小明：我只有170厘米，太矮了！
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小明： Wanggang, long time no see. You are looking very tall. How tall are you? 王刚： I am 180cm tall. During the summer holidays I exercised and swam everyday. Maybe that is why I have grown. 小明： It must be. Exercise is good for your body. 王刚： Xiaoming, how tall are you? 小明： I am only 170cm, too short!