我身体素质不好用英语怎么说

我身体素质不好用英语可以说 "My physical fitness is poor" 或 "I have poor physical condition."

"Physical fitness" 指的是身体的健康状况，包括身体强度、耐力、柔韧性、协调性等。"Physical condition" 指的是身体状况，包括健康状况、体质、体能等。

例句：

"I need to work on my physical fitness, I've been feeling out of shape lately." (我需要加强身体锻炼，最近感觉身体不够健康。)
"Due to my poor physical condition, I couldn't keep up with the rest of the team during the hike." (因为身体素质不好，我在徒步旅行中跟不上团队。)