[NICOTINEGUN]

If you really want a work out and get some true to life techniques that could save you in a life threatening situation look into Krav Maga. Krav is an Isrelli streetfighting style based on realistic techniques. It can be expensive to become certified or go to the classes but it is worth it.
Krav is the real deal. You won't ever hear a KM tactician saying they got their ass kicked in the street. They have different classes too: disarming, strikes and kicks, etc. They also have fitness KM. Look into it.
Then, if you really want to get in shape look into mixed martial arts. MMA is an incredible arena now. It gets you in shape fast. I've been studying this and that for years now, but Krav and mixed martial arts got me to the level I never thought I could be at. With the combination you will put blackbelts on the ground crying. They don't know what hit them. Plus, it is motivating and good for you. Good luck, and stay strong.