i dont really understand regen! could someone help me?
Once you train Regeneration in the Dojo, you will see a small bar next to your stamina bar. That is your regen bar. It fills up with each dig you make, and when it is full, it restores 1 stamina.
Upgrading Regeneration reduces the number of digs needed to fill the bar, and some equipment can increase how much stamina is restored. Hope this helps!