I recommend you to set up a web page/website and offer your ebook. You can get a website for as little as $5.99 a month and marketing it can be wonderful!
(((Affiliate Programs)))
Have you ever heard of ClickBank? The best way to market your product is through affiliate programs. You let people sell your product for you and give them a specific amount on every purchase that they drive to your site. ClickBank is free so you do not have to pay anything, and people will sell your product for you.
(((Classified Ads)))
Also, I recommend that you post articles in classified ads, most of those are free, and drive people to your website.
(((Post eZines)))
Also, you can join ezine websites and post articles regarding exercising and put the link to your website at the end of each article.
(((Sell it on eBay)))
Also, you can also sell your ebook on eBay as well. There are no up front costs, and you pay fees based on the details of your auctions at the end of a 30 day period.
(((Let other ebook sites sell it for you)))
Also, you can email different websites and ask them to sell your ebook for you. Most websites are looking for new products so this can be very profitable. However, you have to be very careful, and make sure that these sites pay you correctly. Most sites will just charge you a percent or flat rate of the total price of your product. So you have to make sure that they provide snapshots of what they have sold so you can get your correct amount owed to you. Make sure you come to an agreement, and stick to it. This can be very profitable!
So there are so many ways to drive people to your website.
If you need a mentor or an advisor, I would be glad to help you as much as I can.