Blaine attempts to hang upside down for 60 hours

What’s David Blaine up to? Oh, just hanging around.

The magician-daredevil is proclaiming “I’m doin’ all right” after starting his latest endurance challenge on today – 60 hours hanging upside-down, without a net, above Wollman Rink in Manhattan’s Central Park.

Blaine – sounding nasal from sinus pressure – kept smiling while describing the “enormous push of blood” that made it feel like his head was “about to explode.”

As a kid, he was intrigued when Harry Houdini dangled from a crane by his ankles while escaping a straitjacket.

Blaine said: “The legs go pin and needle very fast.” Stretches – kind of an upside-down sit-up – seem to help.

If inquiring minds really must know, Blaine uses a catheter when nature calls.