Paddling: Shoulder mobility is of vital importance when paddling. An efficient paddle stroke requires smooth rotation of the shoulders in their sockets in order to pull your hands through the water (similar to the gears on a bike).Standing Up: Those with tight hips and hamstrings tend to compensate while standing up by leaning their head off the side of the board to make room for their legs to tuck in beneath their body. A flexible lower body (i.e. hips, hamstrings and glutes) addresses this issue.Riding: To maintain balance when riding the stabiliser muscles in your core, thighs and glutes are constantly activated. Strength and mobility in these areas will provide you with a balanced platform from which to surf.