Just like a healthy mind requires a healthy body, a strong mind needs a strong body in order to thrive.
To make dreams, vision and will come true and manifest in the physical world, one needs to go beyond mastering thought forms.
This is where self-mastery kicks in. He/she who masters the self can master his/her world. But the world is a physical place. The body can either be just an exploratory and sensory vehicle to navigate through it OR the tool and extension of the mind to turn your inner world into your outer world.