"I don't want to do construction work because it is physically draining."
- "I don't want to do construction work because it is physically draining."
"I don't want to do ~" 「〜をやりたくない」
"construction work" 「土木の仕事」"manual labour" も言えます。
"because ~" 「〜ので」
"it is physically draining" 「体力的に厳しい」