Great question!
Sound waves enter your ear canal, and the ear drum starts to vibrate. This tremble causes tiny bones to move, "knocking" on the membrane window. Cochela has a ton of little hairs inside it, and once you activate it with the membrane window, those hairs change the vibrations to an electrical signal. That signal moves to your brain, and your brain tells you that you hear a sound.
Low density lipids (lousy) to high density lipids (happy).
I would be able to help if you had a picture of it up
Im not quite sure but i would go with
1. changing to a completely new type of activity - overcoming a plateau
2. making your goals easier - restarting after a break