How I would improve this "Get Fit Immediately" Ad

I loved this ad. Because it brings in new sales (not sure if the product works). I asked the owner how many people bought it and he said about 10-20 people a day. He also said people come in and ask about it all the time. This is amazing to me because he is selling it out of a general convenient store… not a health focused store.
Here is what I would do to improve this ad:
1. Show me before and after pictures. Can my gut really beĀ eliminated by wearing that thing?
2. Show me the price. Looks expensive… but I would consider buying it if it was $19.99. This advice might not be good for the convenient store because customers won’t come in and ask about it.
3. Guarantee me results with a full money back guarantee.
4. Tell me I can try it on in the store
5. Show me a real customer testimonial
What would make you want to buy this product?