他个子不小呢。

Tā gèzi bù xiǎo ne.

His build is not small.

他个子比较高。

Tā gèzi bǐjiào gāo.

His stature is rather tall.

她个子不高，但是跑得很快。

Tā gèzi bù gāo, dànshì pǎode hěn kuài.

She is not tall, but she runs very fast.