Jon Reading wrote:
Mechanics is a fundemental concept in aikido. There is a relationship between mechanical efficiency and effort that is stressed in aikido (think of a pulley system used to lift heavy objects as an example of mechanical strength). Greater mechanical efficiency requires less effort. Why use one pulley to lift a heavy load if I could use two? Why not move my feet if I can significantly reduce effort by doing so?
With correct timing there is no need for mechanical strength, no lifting, pushing, pulling, no need for extra pulleys. Nage should not feel any resistance from uke. Less movement for same results requires less energy and greater efficiency.