Pǎo wán bù hòu, shuāng tuǐ ruǎnruǎn de shǐ bu shàng lì.
After the run, both legs were weak and wouldn't respond.
Tips
grammar
软软 is the reduplicated form of 软, giving it a more vivid, tactile quality. Reduplication of adjectives in Chinese often conveys a gentle or endearing tone, especially in descriptive contexts.
