I read this as "Does Zuma work?" and I thought, mmm, a thought provoking discussion.
But then I realised my error.
<Side bar: I think Zumba like anything works, but only when combined with discipline, and a calorie restricted diet. I suggest you commit to an eating plan for 1 month, and if you are able to do that and include a 30 minute walk every 3 days, then reward yourself with buying the video. If you are anything like me, you purchase stuff, and part of the "purchase" is that you immediately feel you should be losing weight right now. Use the video as a reward, but start the process before hand, by keeping a food diary and looking at what you eat and also increasing your exercise - which all does not cost any money, but is just time and effort.>