It is said that if people were to fly like birds, our wings would need to be at least *6.7m wide (about 2ft). People also talk about strapping on wings and flying like a bird on Saturn's moon Titan; because the gravity is very weak, and the atmosphere is 50% thicker than on Earth.
Titan is pretty far - but I think this experience should be possible on Earth's moon, where there is 1/6th earths gravity; and if you build a nice dome then you could pressurize the air to earths pressure. I can't say for sure - but I think (with enough effort) human-powered short flights should be possible; or at least wing assisted giant leaps will be possible! (Kind of what chickens do).
One limitation is arm muscles which are a bit weak compared to our leg muscles. For example the human powered helicopter AeroVelo Atlas and Aeroplane Gossamer Eagle both used leg power. For thrust we might might benefit from using giant fins like with freediving in water, but bigger. And then wings would be for lift and control.
*These people are Payal Marathe, who wrote this in Yale Scientific and everyone quoting her, I haven't found any other source.
https://www.yalescientific.org/2013/03/qa-why-cant-humans-fly/
Check out Heinlein's Menace From Earth.
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