uncoiled from the thighs on down.

[Maybo]

I didn't try to get to my feet, just squatted and uncoiled from the thighs on down. I flew over the rolling gold like Superman and landed on top of him.

Source: Fairy Tale by Stephen King

What does "uncoiled from the thighs on down" mean?

 

[dunchee]

He jumped.

 

[Maybo]

Does “thighs on down” mean the thighs are at low position?

 

[emsr2d2]

No. It means that he engaged his leg muscles, starting with the thigh muscles then the lower leg muscles. The result was him jumping and "flying over the rolling gold etc".