David Blaine does amazing physical feats and he also does some pretty decent magic tricks. I suspect the tricks have caused a lot of folks to assume that the physical feats must therefore be illusions and that he's not really holding his breath that long or going without food for that long…but he does really do some of those seemingly-impossible things.
Here's a twenty-minute talk he gave about how he was able to hold his breath for seventeen minutes. You may wind up thinking he's crazy to attempt this stuff or you may admire him for it. But I'll bet you think of him in a different light after you watch it…