I'm not on Zwift, but I have been trying out Workit, which is a LN fitness app. I'm only using it for step counting, so far.

They have challenges with sat prizes and some element of social interaction. Today, my first challenge is starting. We each paid in 10k sats and I think it gets divvied up amongst those who walked 10k steps everyday, plus a 300k airdrop.

I had been doing the 100 pushups a day until $100k thing, but my wrist was defeated after about eight months. Now, I'm trying to do 100k steps per week until $100k.