Do you heal more quickly than other people, or faster than what your doctor said at the time of recovery, after an accident, an operation, a sprain or strain or a bout of acute illness. The faster the recovery the healthier you are. A long period of wakefulness and wanting to hug the bed for a few more minutes is not sign of vigour but gradual loss of energy. The oftener you get this urge to step out, the healthier you are. Good posture without any attempt to correct it is a reflection of health.
Flexibility is a good sign of health.
If all your joints, muscles, tendons and ligaments are supple and flexible, it is indicative of health. If you have to run for a bus or walk a distance of a few miles because you have missed the train or bus and you are winded or have little stamina for sustained effort a fair period of time, the chances are that you are below par in health. If you can read the smallest print without glasses and then immediately can perceive an object at a very long distance, the chances are you have good health. Next pick up your flesh. The former is an indication of health.