A combination of good diet and fitness is what you need, in terms of the importance of each aspect its 70 percent diet and 30 percent fitness.
Hope this helps.
If your'e trying to sell online, I was just doing some reading on this page : https://www.1and1.com/digitalguide/online-marketing/online-sales/e-commerce-in-america-flourish-online/ Basically theres some really interesting toolkits that you can use that have some built in features for you to...