I wasn't sure what to expect, but it's a pretty solid game. It scans you're measurements, you input your age and weight, it tests your initial ability, and the game suggests a level of difficulty and areas to focus on. It's quite clever really!
The exercises work on the whole great, but I had a few issues with the trainer telling me to stop having a break when I was actually on my feet doing the exercise, which I thought it should have known since my body movements appear on screen. On a less important note, the voices get annoying really quickly. Especially when they repeat "You got it, great!" five times in a row, I will need to figure out how to turn them off. Also the menu navigation is generally OK, but when it asks you to create a character to represent you, it takes a while using your hand. It gave me a starting point to work from; a morbidly obese Mexican looking chap, so needless to say I spent while changing him to fit my appearance.
Anyway, the actual logistics behind the game are great; you set a goal, and select how many days a week and for how many minutes you want to work out. Simple as that. For the price, it is definitely worth doing, and will easily get you out of breath!