Is it "Jewish" to exercize

Some people have a sense that it is not Jewish to pay attention to one’s physical needs and that it is more spiritual to eschew physical activity. However, that is not the case. Already R. Yochanan gave us this advice: “spend one-third of your time in sitting, one-third in standing and one-third in walking (Kesuvos 111a)”. Shabbos 147a advises exercises after a bath, which Rabbeinu Chananel explains to mean: “one bends and stretches the arms forwards and backwards as well as the legs on the haunches so one becomes perspired and warm”. Rav Sheshes said: “great is work for it makes warm those who engage in it (Gittin 67b)”. In Talmudic times Jews played a form of volleyball (Koheles Rabba12:11) and a sport in which a ball was thrown against a wall (Yerushalmi Sukkah 5). Rambam (Deyos 4: 19) advises exercize as an aid to gastrointestinal health. He prohibits exercise on Shabbos because it is a form of healing (Shabbos 21”28). He farther wrote: “For there are many things that are necessary or very useful according to some people, whereas according to others they are not at all needed; as is the case with regards to the different kinds of bodily exercise, which are necessary for the preservation of health according to the prescription of those who know the art of medicine . . . Thus those who accomplish acts of exercising their body in the wish to be healthy…. are in the opinion of the ignorant engaged in frivolous actions, whereas they are not frivolous according to the Sages." (Moreh 3, 25)