Just an idea, but a suggestion was made to reward biking/exercise in Greencoin with a proof-of-post in Steemit to show the activity. Perhaps similar to how the Actifit token is awarded. https://steemit.com/actifit/@kewpiedoll/re-lightsplasher-actifit-lightsplasher-20190318t143315271z
One issue is how to create buy support on GRE if large amounts of rewards are dispersed. One ideas is to reward activities based on the amount of GRE that an account already holds, that way if people are all sell and no hold they won't get as big of a payment for their activities. I would suggest a maximum amount per GRE address, per Steemit post, per day, taken out of the public block reward that is currently not being used. (and burning the rest of the reward pool per day if the coins are not dispersed) Any other ideas?