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

The magician-daredevil proclaimed, “I’m doin’ all right,” after starting his latest endurance challenge Monday – 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 child, he was intrigued when Harry Houdini dangled from a crane by his ankles while escaping a straitjacket.

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

Blaine, 35, is scheduled to exit from his perch at the climax of a live, two-hour ABC special, “David Blaine: Dive of Death,” on Wednesday.