Bellyak­ing — not to be con­fused with belly­ach­ing, which is what you’d be doing if you missed out on an oppor­tu­ni­ty to bellyak — is face first kayak­ing, or body­boat­ing, or fly­ak­ing. What­ev­er you wan­na call it, it looks like a lot of fun. The first bellyak was made from a cut up kayak, 18 cans of expand­able spray foam, 6 rolls of Duct tape and some plas­tic sheet­ing. In the video above, Adam Mas­ters and Callan Welder of Bellyak nav­i­gate Sec­tion 9 of the French Broad riv­er on the lat­est prototype.