An affordance is an opportunity. It is an  invitation to act.'  The environment invites us to interact with it.  Keep reading, you'll see.
 
Young chlidren are wonderful at accepting these invitations as they explore their environment: Rocks need to be tasted, railings need to be walked on,  small spaces need to be squeezed into, and on and on. 
 
Adults somehow cant see these 'invitations' as well as younger children can.  But sport presents these invitations as an agreed-upon movement problem to be solved by an individual or team.
 
Movement educators can present these 'invitations to act' as ways to encourage  adaptation.  (See ecological dynamics, contraints lead approach, perception-action-loop  and more to learn more about the words that  describe what humans have been doing all along.)
 
(See child development theory to explain why exploration is HUGE for the success of little humans to grow into successful bigger humans.)