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The most powerful muscle is still your mind - Marc Perry
It means that your mental fortitude, your discipline, and your belief system are ultimately more critical to your physical transformation than the actual strength of any single muscle in your body.

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A strong body builds a strong mind, and a strong mind builds a stronger life - Michael Matthews
At its core, this is about compound growth for your character. It's the principle that physical discipline is the most direct and tangible training ground for mental and life discipline.
A strong body starts with a strong mind Meaning Factcheck Usage

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A strong body starts with a strong mind - Michael Matthews
At its core, this quote means that your physical transformation is 100% dependent on your psychological foundation. The mind is the pilot; the body is just the plane.