You say that you are in good condition, that you feel nothing... And indeed, so you appear.. But we want to put you to the test:

1 - Your Nervous System

Bend down to pick up something from the floor, then straighten up quickly without raising your head. Repeat this exercise four or five times; if you feel a pain in your neck or in your head, be certain that your nervous system is not sound..

Another exercise: stretch out your hand, spread your fingers apart from one another, and place on the back of your hand something light — a pencil, for instance. If your hand trembles, ... consult your doctor...

2 - Your Walk

Even if you are unaccustomed to long walking, you should be able to walk six to seven kilometers without any fatigue... And if you feel any weariness in your legs, consult a specialist, for you are ill.

3 - Your Heart

Climb 40 steps of some staircase, or jump 40 jumps, and count the beats of your heart. If the beats do not exceed 92 to the minute, you are sound of heart; otherwise...

4 - Your Hearing

To test your hearing you need another person... Stand about five meters away from him, and let him murmur some sentence. If you can catch the words with both your ears, you are sound. Try this several times...