If we can't move well on land it's pretty difficult to move well out in the surf. Surfing is a physically demanding sport and requires strength as well as adequate range of motion in the hips, as well as shoulders especially.
A certain level of rotation is also required for maneuvers such as cutbacks and deeper bottom turns. If we are stiff and tight, our body will compensate to try and perform - and this can result in a rigid style - not to mention injuries that can keep us out of the water.
Check out and follow along with this routine to stretch out and mobilize the body for peak surf performance.