We also study God's words to receive stimulation. Stimulation is needed if our internal organs are to work properly. Thus in order to maintain good health, the body must be given proper stimulation. This also applies to our spiritual health. Our spirit cannot live without the proper stimulation.
Cold showers are good because they stimulate our spirit and body.
After jogging it's better to take a cold shower. Sometimes you take a cold shower when praying. This is good for your physical body as well, the stimulation helps the body function properly. We often hear that jogging is good for our health, but if we jog in the wrong way it may harm our body. A man who wrote a book about jogging died while jogging, because he was jogging in the wrong way.