身を削ってまで他人の世話をするべきか　みをけずってまでたにんのせわをするべきか Should one serve strangers even to the extent of sacrificing your health? 身を粉にしてまで働く　　みをこにしてまではたらく To work until your body breaks into formless pieces 【powder 粉＝こな＝こ】 (身)体に危害を及ぼす可能性がある　しんたいにきがいをおよぼすかのうせいがある There is a/the possibility of causing physical harm to your body 体の具合がいい　からだのぐあいがいい 身体の具合がいい　からだのぐあいがいい 体＝からだ　　頭と手足を除いた胴の部分のみ　　あたまとてあしをのぞいたどうのぶぶんのみ The torso part only (excluding the head and arms, hands, legs) Technically speaking. 体調＝体の調子はどう？　からだのちょうしはどう？／たいちょうはどう？ 身体＝体全体 からだぜんたい　you read this both as しんたい　and からだ

You cannot always use 体 and 身体 interchangeably.

Got it. Therefore, could I use 体 and 身体 interchangeably? Thank you for your reply!

It is very difficult for japanese to explain the difference between 体 and 身体. These words have nearly the same meaning, by the way, they both mean a body. 身 has the same meaning but also means meat.