That's the whole catch: Moving finite objects. It might, I say might, be one thing to send a particle or even a stream of particles backwards in time. But to send a specific organization of particles (like, a man) through a wormhole or some such system, and expect it to come out the other end intact... well, let's say that although it might be theoretically possible, the amount of energy and control needed to pull it off would be so close to infinite as to be impossible.
And that doesn't even get into aiming for the right spot to land...
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