Internet says an average adult breaths 12 - 20 time per minute. Assuming 20 breaths per minute, that comes out to $1,440 dollars per day($0.05 × 20 breaths × 60 minutes × 24 hours)

If you're dedicated, you can walk 20,000 steps in a day. It's not easy, but it's achievable. This would yield $5,000 per day.

For perspective, if you were smart and chose the $5,000 per day, it would take you 547 years to earn your first billion and 131,416 years to have as much money as Jeff Bezos.

Edit: I lost some decimals. I fixed the calculations