Peleton design and manufacture their own equipment, they ship it globally, they have their own buyers and supply chains for that, They also build the tech that runs their business, from the customer portal to the video integration in the products. They make programs that include CGI and motion graphics. They do sales, and support, for nearly 6 million customers. On top of that there's payroll, and admin, and HR, and ... it's a very long list, that requires a lot of people.
We're bad at estimating large numbers so our first impression is usually wrong. It's important to factor that into any reaction to a number that sounds way too high. It's always worth taking a step back and thinking about why it might actually be correct.