Go to Chun-Nan and enter the Gaia gates, then go up the rocks on the right side.

Then do you see that line of rings there? Well press the Y button and you will use the light dash on them.

Wait 8 seconds and then they will reappear. Either boost to the rocks again and start over or jump and at the right time quickly press the Y button to go through them again.

This is way better then tracking down Wentos and buying 99 hero sandwiches.