Looking for Side Hustle Ideas That Combine Fitness and Sustainability

I’ve been juggling my day job as a fact-checker with my love for extreme sports and hydropower, and I’m itching to start a side hustle that ties into those passions. Something active, maybe even outdoors, but with a sustainable twist think eco-friendly fitness coaching or gear rentals powered by renewable energy. Has anyone here turned their fitness or sustainability interests into a side gig? Curious what’s worked for others or what pitfalls to avoid. Bonus points if it involves traditional medicine or adventure sports!