The good thing about functional training is re-teaching your body to use synergist muscles in compound movements instead of isolating. This results in higher metabolism and overall better balance, coordination and overall body function. You will notice everything physical becomes easier. When they say muscle has memory they aren’t talking about the ability to re-grow faster. They are talking about the muscles ability to memorize movements like walking for instance. When you participate in functional training, you are teaching your body to use all the muscles you have for a movement.