We agree that it isn't the work-out that makes you eventually stronger. We attribute muscle growth to the rest period, generally. I think factors that help cultivate optimal 'recovery' from the trauma put on the body include diet, sleep, and emotional enrichment. I think some people would also argue that you need exposure to the sun and purer oxygen, ideally.
We have to be realistic with the cyclical rhythms of this body. It's been thrust into a society (this one particularly American) that doesn't honor rest. You can't expect to get the same results on this physical plane during Winter as you do in Spring as you do in Summer.
Prioritizing a season of relaxation is imperative to the flow of energy both creative and linear.