yep, practice holding your breath. Before I'd do my yearly pilgrimage to CR, I'd spend the month before, getting a base tan, practicing being hot, paddling up and down the beach, and holding my breath. One year I got reamed by a giant 4 wave set in Matapalo(23 footers). while being held under, I thought that since I could do 2.5 min in a tanning bed, I'd have no problem doing more under a true life drama situation.