We but mirror the world. All the tendencies present in the outer world are to be found in the world of our body. If we could change ourselves, the te… - Mahatma Gandhi

Exercise is as much of a vital necessity for man as air, water and food, in the sense that no man who does not take exercise regularly, can be perfectly healthy. By “exercise” we do not mean merely walking, or games like hockey, football, and cricket; we include under the term all physical and mental activity. Exercise, even as food, is as essential to the mind as to the body. The mind is much weakened by want of exercise as the body, and a feeble mind is, indeed, a form of disease. An athlete, for instance, who is an expert in wrestling, cannot be regarded as a really healthy man, unless his mind is equally efficient. As already explained, “a sound mind in a sound body” alone constitutes true health. (Chapter VII, Exercise)

I came in contact with every known Indian anarchist in London. Their bravery impressed me, but I felt that their zeal was misguided. I felt that violence was no remedy for India's ills, and that her civilisation required the use of a different and higher weapon for self-protection.

The chief agency for keeping the blood pure is the air. When the blood returns to the lungs after one complete round over the body, it is impure and contains poisonous elements. The oxygen of the air which we inhale purifies this blood and is assimilated into it, while the nitrogen absorbs the poisonous matter and is breathed out. ... The air which we inhale is taken into the lungs through the windpipe, and the blood is purified by it. It is of the utmost importance to breathe through the nose, instead of through the mouth. (Chapter II, The Human Body)