Although obviously contrived some of his feats defy logic as to how he he does it with/without props or fixed audience participation specifically the "leaning over backwards" routine. Whether it is carried out off camera and then superimposed back in for TV purposes I really don't know.
If he came into my house and did the tricks without a crew, stooges, camera etc I d be convinced! Found it entertaining at first but tricks so far fetched I get bored