After carrying my windsurf board on my head for many years, I can only say that this is not healthy for the neck vertebrae: C6-C7 hernia.
Here, there is a difference of 500 meters between the high tide and low tide lines and a tidal range of about 5 meters.
Mainly after the windsurfing session, I carried the windsurfboard and sail on my head up to 30 to 35 knots, sometimes even with just one hand.
But the wobbling of that weight took its toll. Fortunately, after a short period of physiotherapy, the hernia is gone.
But I won't be carrying the board on my head anymore.
Isn't there a way to carry the windfoil board on the shoulder through the surf?
