I'm gonna guess that skaters have generally a lot stronger ankles and lower body, legs, knees but surfers using the upper body a lot so they probably look a little bigger in the shoulders and lats and neck.
我猜滑冰运动员通常有更强壮的脚踝和下半身,腿,膝盖,但冲浪者经常使用上半身,所以他们的肩膀、臀部和脖子看起来可能更大一点。