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great example :)

This is not an example of lack of free will. You can decide to jump off a building and expect to float in mid air. Whether it actually happens according to your expectations is a different matter.

Actually what this example shows is that there are limitations to what anyone can do. It's probably more accurate to talk about degrees of freedom instead of free will or lack there of in absolute terms.

Freewill doesn't mean unlimited power. There's a word for unlimited power which is called "omnipotence." Freewill simply refers to a person's ability to choose between the available options. Crying over the options that are not available to you is not gonna remove your ability and power or free will to choose between the options that are available to you! :]

Any freedom in the physical world is always regarded in the sense of degrees of freedom. If by free will you mean an absolutely disconnected omnipotence, then stating the non-existence of such a concept of free will becomes a trivial and almost meaningless exercise. In any interacting system, the constituent degrees of freedom are constrained by each other through interactions. But to be constrained is not equivalent to be determined. I believe this to be the key issue to any meaningful discussion around the concept of free will.