Surfing is a very unique sport, in that there are many different elements to deal with; a surfboard, constant changes of the ocean, other surfers, sea pest, and the sun. Basically it is a very hectic sport. You always have to be on top of it or you are going to get hurt or to the extreme you can lose your life. Now I have your attention, lets talk specificity of training and surfing. When training for specificity, you want to perform exercises that will mimic what you do in the water. No I don't want you to flail around like a kook at the gym. Your exercises should be as close to what a surfing maneuver looks like, be it a cut back or a simple paddle. Obviously we cannot duplicate all of the surfing maneuvers out there, but we can try our best. If it looks like surfing, and smells like surfing, you are the right track, it should help your surfing.