The site is concept2.com
When we first got the machine I tried it but didn't get the bug. When we got something in the mail that mentioned the "holiday challenge" I thought I would try again and that was enough to get me over the hump of rowing regularly.
On the topic of yoga - pilates is similar and offers a bit more cardio and strength work along with stretching and lean muscle building. can't get enough of it! combined with a bit of weights it works great. I have torn cartilage in my throwing shoulder but I have found that pilates keeps my shoulder muscles strong enough to prevent most of the dislocation events that used to plague me.
I purchased 1 of the dynaflex gyro balls. I just figured out how to get it spinning. wow what a burn in my forearms. I liked that they say it will help for musicians as well as atheletes I play bass guitar and after an hour of playing my fingers are really cramped. Too early to tell how well it might help but so far so good!