Before a LLM lesson, your heartbeat increases
During a LLM lesson, you pulsate like a mad dog.
After a LLM lesson, your can't even feel your heart beating.

This is because
Before a LLM lesson, you are so phreaking nervous you can jump out of your clothes.
During a LLM lesson, your adrenaline rushes like a sprinter.
& After a LLM lesson, you heave a sigh of relief that your race is over.

Life is like a race, just like a LLM lesson. (: