What's the best way to reach out for users on fitness?

I would suggest you to get into tiktok/reels marketing game. A huge amount of fitness enthusiast people spend time on this platform. Also I suggest you to work on the design of your landing page.

AFAIK, there are many discord channels. Because I heard that from some friends of mine who interested in fitnessactively.

FB Groups in Fitness

I think you should reach out to fitness communities and consider forming partnerships with related companies, such as fitness equipment brands.

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I think a very good option would be to use growing fitness influencers (thousands emerge every week) with an already-formed audience since these will allow you to reach the type of audience you need without making such a high investment. I have experience having helped turn just $100 USD into 8.6 million impressions, and I would love to connect with you and exchange ideas

hit the gyms and ask people to try it out.

Hey Derrick! Congrats on launching Aivocado. You could try getting involved on fitness forums and social media communities where your target users hang out. Offering free access to the beta test in exchange for feedback might motivate more folks to join. Also, collaborate with fitness influencers and bloggers to spread the word. Let's make health a priority!

Engaging with fitness communities on social media. Personalized engagement always stands out.