Yes, you gain muscle memory and your body gets used to reacting quickly, but you must stretch in order to retain it.

Yes, you gain muscle memory and your body gets used to reacting quickly, but you must stretch in order to retain it.

You don't. You have to build it up then drop whatever extra weight(Specifically body fat %) you gained while trying to retain the muscle. That is how you get definition.

The brain is like a muscle the more you work it the stronger it gets. If someone is involved in a conversation and they are not just listening, they are contributing something to the conversation then 70% of the conversation will be remembered. If a person is just listening to a conversation withou contributing anything to it, they retain about 20% of that conversation.