No exercise in the world can get rid of your pooch, I'm afraid. The nature of fat loss is that it is a total-body process, and not even JM can get rid of it (marketing materials aside.)
Because weight loss is about the food you eat, you adjust your eating to the exercises you do, so which cardio you do is less important than finding something you enjoy and will stick to.
Many people speak highly of the program, and if you do a search, you'll find lots of threads about it. Just understand you can't target your trouble zones for fat loss!
Make sure that you have spoken to your doctor about your new exercise program before beginning it. Particularly since you have some back problems (although everyone should check with their docs first) you need to get clearance to prevent further injury!
Writer, mother, wife, and breadwinner. I love to run, but running doesn't love me, so I'm switching to my low-impact bike.
I'm not pregnant, just fat: My blog. fatnotpregnant.blogspot.com/
| current weight: 190.6