I love this game - the versatility and player specific workouts are excellent.
You can design your own avatar, work out on different difficulty levels and choose from a range of exercises including boxing, yoga and circuits on as many or few days of the week you want to.
There are weekly weigh-ins (in lbs or kg) and challenges to keep you motivated throughout the week, its like the tv show but without the nastyness of the other competitors. Im still on the easiest mode but for me it can be a struggle sometimes (this is good).
You can add resistance bands and balance ball for even more variety but if you use a balance board it is a bit of a pain moving it around for different activities, the game is still good even without the extra equipment.
There are a variety of locations so it doesn't seems to repeat itself (like a workout DVD does). Set up on your own for 4/8/12 week (and other) challenges or just play as a visitor.
I have a very small space to exercise in and can manage all routines except a couple (partly due to my poor strength and fitness)
The routines vary EVERY time and are targetted to your needs (based on the built in fitness test or you can set this up yourself).
The only problem is that sometimes the Wii control does not connect properly to the box and record your progress, this effects your score, particularly with jumping rope, jogging and knee lifts. My favorite yoga position is upward facing corpse (I'm just lazy!), where you simply lie on the floor breathing - seriously though, a 30 minute session will push you and you will build up a sweat and burn calories.
There are other bits to it including recipes and health and lifestyle tips but I don't bother with these as I am losing weight through a local slimming class.
I love Bob the best (Gillian scares me) but you can choose Bob and Gillian or just one of them to work out with.
If you don't work hard enough you get voted out and have to start again so be warned ! I won the Biggest Loser 4 week challenge and Im really unfit so its not impossible you just need to stick to your goals.
I would definitely recommend this game, I never really write reviews but this deserves a good one.
Enjoy !