Physical health comprises much more than simply avoiding sickness. To be in optimal physical health, you must eat a healthy diet which supplies you with all of the nutrients that your body needs, exercise, get plenty of sleep, drink plenty of water, and avoid substances that have a negative effect on the body.
Once you have learned how to provide your body with the things it needs to ward off disease and to heal itself, you will experience a level of proficiency (both mentally and physically) that you never thought possible. I encourage you to continue caring for your physical body throughout your days. No one should want to be sick and miserable and die before having lived a long life and having done all possible to help others in important matters pertaining to life on earth, and the life after death.