Thanks to Arts & Letter Daily for this link to indispensible advice from the Wall Street Journal (To Have and to Hold: The Key
To Wife Carrying Is Upside Down):

The best way for a man to carry a woman is to dangle her upside down over his back, with her thighs squeezing his neck and her arms around his torso.

One “passenger” entered in the Wife Carrying World Championship in Sonkajarvi, Finland, was quoted as saying “It’s not so bad. But you don’t see much“.