I dont think so jogging for 30 minutes its the best cardio workout ever
Insanity workout or Biggest Loosers is good :)
If done correctly, the horizontal mambo burns calories and is never boring. :-)
I like the elliptical. But take a kickboxing or hip hop class at the gym. Great way to burn calories and loads of fun.
Well I like TaeBo, dunno about gaining muscle though