DealBook has an exclusive interview with Aleksey Vayner, which took place over steak in a Jersey restaurant.

Excerpts:

Despite all the mockery that the video has inspired, he still speaks proudly of his athleticism. Nearly all the feats in the video are his, he said, and they are real. (The only doubt in his mind lies in the skiing segment, which he says is probably him.) When asked about a posting Mr. Vayner had placed on the classifieds site Craigslist soliciting skiing videos — a posting that was reproduced on a blog that questioned whether the skier was him — Mr. Vayner said he was simply looking for the cameramen who shot his ski-jump efforts.