Crowdfunding for startups is a difficult task if there isn't a tangible product at hand currently. If he kept the funding on a personal level and only involved family and friends, then it could work, but that opens pandora's box of "borrowing" money from people you have a non-business connection to.

Hi:
As Sean offered, crowdfunding is very challenging without a tangible product. Plus, has your nephew defined the target market for his fitness business? I'm guessing it is much smaller than the average crowdfunding universe--at least as he's starting up.
Instead, I think investing that time and energy into building his business base would be much more productive. Defining his target market, determining the best avenues to go after that market and delivering service that ensures repeat business--and referrals--are core building blocks to establishing a personal service business.
If you (or he) wish to discuss, send me a PM through Clarity for 15 free minutes.
Cheers,
Kerby

The way to know is start a few projects + see.

Likely best to only start one project at a time... meaning only one crowdfunding site running the project at a time.

So use different sites in sequence, rather than simultaneously.

And... There's a far better way to do this... at least as a test.

1) Come up with something to sell.

2) Open a http://Meetup.com group with fitness as the category.

This might not seem so powerful + here's a tip.

When you start a Meetup group, once your group is approved by the Meetup Trolls (dark beings who issue such approvals), sometime in the next few days, they will send an email to every Meetup member camped on the fitness category.

You can't find out the numbers any more, because Meetup stupidly (was one of the best marketing tools on the planet) turned this off several years ago.

And, just so happens, last time I helped someone setup a fitness related Meetup group in Austin, TX there were...

15,000 Meetup members in Austin, camped on this topic.

So, when you setup your Meetup group, set the zipcode of your Meetup group to the closest zipcode to you which has the highest population density.

Crowdfunding can work well when there is a real product, as already commented earlier. But whether you have a great idea or not, it is important also to understand that crowdfunding is complex. Successful crowdfunding campaigns are most often run by professionals or marketing agencies. So the odds to succeed on raising funds can are not that high. Also you need to find the right type of crowdfunding. From a learning point of view though trying to do a crowdfunding campaign can be a great experience. If the business is a physical business in fitness, like a gym, there might be other ways to fund it, but being a fresh grad and having zero experience in business will make difficult to raise funds that way...

Crowdfunding is the process of funding a venture or project by raising small amounts of money from a large number of people. Crowdfunding for start-ups is a common practice, and it’s also often used by inventors, entrepreneurs, musicians, filmmakers, artists, and charities. tour, the band raised $60,000 from fans – and in the process, created the blueprint for today’s crowdfunding sites. With so few business models you can start without capital, crowdfunding brought opportunity and democracy to funding. Then crowdfunding went mainstream, and online crowdfunding platforms flourished. Today, most crowdfunding is conducted through crowdfunding sites like Kickstarter or Kiva. Pimax launched a crowdfunding campaign on Kickstarter for “the world’s first 8K VR headset. They used the campaign to bring the product to market faster and to improve the product, based on feedback from fans and customers. Crowdfunding is rapidly expanding each year. Each popular crowdfunding platform has a highly engaged community of investors and customers that are incredibly easy to access.
You can read more here: https://www.oberlo.in/blog/complete-guide-crowdfunding
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath