just created a blog today after reading numerous post on adsense and many other advertisments.Do you think there is potential.
http://superiorstrength.blogspot.com/
http://superiorstrength.blogspot.com/
The physical fitness niche is an expansive one. To give you an idea of just how big the physical fitness niche is consider this: Over 5 million users searched the big G last month for the keyword 'exercise'. Approximately 1.5 million users searched G for abs. You only have one post on your blog which concentrates on abdominal exercises. Is that going to be your sole focus, or will you be implementing strength training exercises for the entire body? If you are going to pursue physical fitness for revenue, I would highly recommend that you narrow your focus to one particular area of expertise. In addition, beef up your content long before you consider putting adsense or similar on your blog.
I would not concentrate on just 1 blog... you should be forming 1,000's of them.