Board in its winter berth
13 feet x 3' x 8" of water

Ceiling mounted Grab line

Board with simulated mast
(no weight shown, use
dangling bucket of water)

Similarly, practice the use of harness. Uphoul has a ring to connect to harness. (click)

I THINK THIS IS A DIAMOND IN THE ROUGH

(if you build a harbour (wet dock) for yourself)

This allows training to be brought inside.
Develop your balancing skills
Develop your sail raising skills
Grasp the basics of harness use
Eliminate (or greatly reduce) the dependance on:
weather
travel
rentals
seasons (like winter)
utalizes short time intervals
takes the sting out of winter
democratizes the sport

Exchange slippers for barefoot
or booties and you are ready for valuable practice