How many minutes of exercise am I supposed to get a day?

delsey2007

I'm not entirely sure how much I should get, but even after 25 minutes (and I can't possibly go any longer) I've only burned 168 calories based on what this says. I play a game on my wii, mostly, "Fit In Six" which is just basically a bunch of workout videos. It's no walk in the park...but am I not getting enough?