Question

Describe why someone who has never strength trained will make big gains very quickly and

another person who has strength trained their whole life has difficulty increase their
maximums.

Answer 1

Answer: hormones and genetics

Step-by-step explanation:

You'll generally see the quickest muscle growth in young, previously untrained persons that start following an ambitious and well-planned whole-body training routine, while at the same time eating a slight caloric surplus and covering their protein requirements

or

It comes down to hormones and genetics. Chances are, you've probably heard before that every body is different, and on a physiological level, that's really true. For example, some bodies are primed to put on muscle more easily than others.