while that might be a little unrealistic, how about I mention something that isn't? I was thinking of starting another thread about it if enough people were interested, but a way to sort of swing that's possible is the 3DMG from the TV show "Attack on Titan". (BTW, I don't recommend watching if under the age of 13, its a bit graphic.) I've done the math, and if you have a body harness rigged up similar to how the show has it, you could swing like they do. Now the only problem would be devising a strong enough winch. Well, as they say, youth will find solutions to things impossible to the previous generation. If you're curious about the maneuvering physics and don't quite get a good enough idea of it from the show, here is a free no-signup browser game you can play to try it yourself.
http://fenglee.com/game/aog/
ALSO, while it would be possible to swing around with these, you would need to be an extremely fit person and would need to undergo training for some time. But still, it's possible. If you're interested in the concept of how the device would work, here's the fake show schematics. While it wouldn't work in real life, the mechanical concepts are surprisingly realistic. Even I agree that there are things to be learned from looking at them.
http://shingekinokyojin.wikia.com/wiki/Three_Dimensional_Maneuver_Gear
Just something I felt like throwing together for those of you who'd really like to swing. I know that I'm always around saying "THAT'S NOT POSSIBLE!", but its not like I like crushing dreams in my spare time. I just want to tell you guys the facts. And also, make sure you newer guys listen to wadaltmon, spider44, and spider,man. They've been here for a while and for the most part know what they're talking about. Not that you all can't have better ideas than us. Just remember, take the time to learn from the people around you. That's the whole point of this thread in the first place!

t: