After 4 months, I have to say that SUP'ing is a great workout, and has some benefit I never had considered before. That said, I'll also say that as a person with low back disc issues, proceed with caution. Don't overdo it. I did. After as many months, I'm beginning to feel better, but it was a painful summer in terms of back tweaks. Some were downright brutal. I really like doing this though. The other nice part is that it's something my wife is into as well, and unlike bikes, when she falls, the consequences aren't quite as severe. ;) But man...with as windy as it's been the past week or so??? I bet kiting would be NUTS!