Is exercising good for health?

Yes, many benefits. Regular exercise is good for almost all of your body: heart, lungs, digestion, immune system, bones, muscles, joints and even your mood and concentration! ideal is at least 30-60 minutes 4 or 5 days per week of various activities you enjoy. If you are over 40, have chronic health problems, or haven't done any exercise in years, talk to your doctor before you start a new exercise program.
Yes it vital . Exercise is vital to good health . Mind, body and spirit.
YES! The most effective preventative and treatment for health. Exercise can treat and help prevent cancer, hypertension, heart attack, strokes, anxiety, depression, chronic pain, sex life, insomnia, energy, weight loss, smoking cessation among other things. Definitely consider starting a good consistent varied and sustainable exercise program. See "exercise is medicine" website. Good luck!