In general your site looks pretty good, but there are a few things that stand out as needing some work.
First and foremost, you do not have a title to identify the site. Looking at the title bar on the browser it appears that your site is named "Your Flat Belly." This needs to be displayed prominently, most likely within the head area on the page. The way it is, when people come to the site they have no apparent way to identify what it is about.
Second, the image you have for your header is interesting but it doesn't seem to have any relationship to the site. Lisa has a site with a similar theme. You might want to
check it out for one approach.
Third, the text is a little hard to read as it is. I would recommend making it a little darker (add a little more contrast) and also just a bit larger.
Finally, there are a lot of grammatical errors. Few things can lose credibility and readers quicker than finding numerous grammatical and spelling errors. It is important to develop good proof reading skills to build an effective site.