Like the above poster said, just do 30 mins of running everyday and you will see improvement, but just remember it is 60% exercise 40% diet, cant get fit with a lot of exercise but crap diet, and vise versa.
What I would recommend is 30 mins of running or some other form of cardio, paired with weights every 3-4 days, lets turn that fat into muscle!!!
Don't just get fit, get ripped in the process.