It’s difficult to run to do mitzvot when your back and knees hurt.
It’s much easier to study Torah in a Yeshiva or Beit Midrash than it is in a hospital.
One must be alive and breathing to do good deeds for others.
Despite the skepticism of some in the traditional Jewish community towards healthy nutrition and fitness for a variety of reasons (which I covered in my last blog post), Judaism has always stressed taking care of one’s health and body. Our holy souls should not be housed in defiled vessels.