我真得开始去健身房了——我感觉身体很差。

I really need to start going to the gym - I'm feeling really ___unfit.

在从事了一年久坐不动、没有锻炼的办公室工作后，他的身体变得很差。

After a year of working at a desk job with no exercise, he became quite ___unfit.

医生说我不健康，建议我开始游泳。

The doctor said I was ___unfit and advised me to take up swimming.