tā / měi tiān / jiān chí / zhèng zuò / shí fēn zhōng / yāo bèi / míng xiǎn / tǐng zhí / le

他每天坚持正坐十分钟，腰背明显挺直了。

He insists on sitting upright for ten minutes every day, and his back has become noticeably straighter.