Yes, you can join multiple fitness affiliate programs. It’s best to start with one so you don’t have too much to manage as a beginner. Before committing yourself to multiple brands, consider what each one offers. You don’t want to risk promoting athletic shoes from Reebok and Nike and not making any sales. If you’re joining multiple fitness affiliate programs, consider finding some that work well together. That way, your readers still trust you and don’t think you’re willing to sell anything. They’ll see that you’re offering everything they need to stay healthy.