祖父は九十歳を過ぎても丈夫で、毎朝散歩している。
My grandfather is past ninety but still healthy, and takes a walk every morning.
子供のころは体が弱かったが、今はすっかり丈夫になった。
I was sickly as a child, but I've become quite robust now.
丈夫な体を作るには、よく食べてよく眠ることが大切だ。
Eating well and sleeping well are key to building a strong body.