Its not just for slalom i started training simillar to this 4 weeks ago and it made a huge difference to my fitness when sailing.
I don't sail much in winter, so on the weeks I don't windsurf, I do a 2km run around the local oval and/or a 10km bike ride up a hill and a 30 minute upper body session at the gym followed by 2km on the treadmill at 3 degrees. Seems to do the trick. I think the important thing is work rate and removing the crap from the blood stream.
skipping
try for 1000 skips a day, 200 intervals, usually only make 500
easy to take rope in bag when travelling
its cool too geoff
Best way to get fit for windsurfing is to windsurf more 
Pitty there has not been much wind this winter as it kills that get fit for windsurfing plan! 
Yes, unfortunately I have learnt long ago that I would buy something like that, use it for about a week and be really pumped on it and then something would come up on the weekend, I would miss the first session and then forget the second and then feel to guilty to start again and it would end up shelved....
I prefer to just be active, do fun things, eat plenty of steak and veggies and not drink too much.
Im not an elite windsurfer so I don't need to be that fit....
If Im not enjoying it, I probably wouldn't do it....
But it certainly helps with the quality of sailing and how much to get out of it...
I would agree with that....
I'm just slack I guess....
I suppose it is a good time filler when there is no wind around....
And to top off the arguement.... JP, Neil Pryde, Naish etc. all tell me that it is not how fit I am that will make me a better sailor, that it is their new board or sail that will perfect my technique and mold me into the perfect windsurfer....
Don't mess with the marketing strategy!
Pitty there has not been much wind this winter as it kills that get fit for windsurfing plan! 
