The Gemara states, “L’olam yivakesh adam rachamim she’lo yechele–Always a man should be praying to Hashem that he should not become sick.”

In the best of health, one should pray to Hashem to remain well. I really should charge you, because if I ever told you anything that was worthwhile, this is it: pray to Hashem for good health while you have it. ~ R’ Avigdor Miller zt”l