The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.

P: Yoga helps promote a balanced development of all the three, physical, mental and spiritual aspects of humans.

Q: They have little to do with the development of the spiritual or astral body. 

R: Yoga is a way of living that aims towards 'a healthy mind in a healthy body'. 

S: Other forms of physical exercises, like aerobics, assure only physical well-being.