If you’re a fitness buff and have the right combination of charisma and business sense, working as a part-time online personal trainer can be both physically and financially rewarding. Once you build up a reputation and client base for yourself, it could easily turn into a full-time endeavor for you. Check out this interview with several fitness blog owners who are making a living online, from MonetizePros. As well, I'd recommend checking out this resource if you want to take this business idea seriously and get started with a business plan for your personal fitness trainer business today.
With the rise of online craft marketplaces like Etsy, people with decent artisanal skills like sewing and woodworking have an always-open market to sell their products as a side business idea. If you’ve always wanted to design and make clothes by hand, then you can start turning those fashion ideas into real, hand-sewn garments and earn a little bit with this side business idea while you sleep and customers from around the world browse your Etsy & Amazon stores.

Video is growing like crazy. And more and more people are looking for professional help cutting their raw footage into viral-worthy content. If you have the right software and a bit of skill, you can easily make money online as a video editor. Check out these article of Fstoppers on how to become an online video editor and then look for relevant jobs on Mandy.com, Creative Cow Job Search, or ProductionHub.
What It Is: Many companies pay online testers to make sure websites are intuitive and easy to navigate. "You basically follow the instructions you're given to check out the website," says Anna Thurman, founder of RealWaysToEarnMoneyOnline.com, a site that has reviewed more than 500 online work opportunities. "It usually only takes about 15 minutes per test." Thurman recommends registering with 10 to 12 different companies since the opportunities to test these sites are doled out first come, first served. "There are people who make $100 to $200 a month by staying on top of those tests," Thurman says.
You'll also need ecommerce software, fulfillment software, worry about warehousing, customer service, refunds and so on. But that's not all. You'll also need traffic. Think search engine optimization, Facebook ads, and other social media campaigns. Sound like a lot of work? Sure, it is. Especially if you do it all on your own. You could opt for Amazon's platform, which might be the easier route. But, then again, at the end of the day, this is a serious business, which could produce significant profits. So you're either all in or you're not. 
I overheard my wife talking to a homeschool mom that raises and sells a certain type of dog (a registered breed of some kind) ranging from $1,000 to $1,800. I also know a couple teens that started a bread business where they sell the product at the local famer’s market and local stores. The product(s) have been so successful, most of the family has been involved in it.
This has become a popular business model for online entrepreneurs over the past several years, and will probably just continue to grow in popularity. The best thing about selling online courses is that once you do the up-front work in creating the course and setting up your marketing strategy, you can get paid over and over again for work you do once.
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