Jannis has always been a fisherman. But Jannis suffered serious injuries in his spine, collarbone and sternum from a car accident which meant he was unable to do all the things he used to be able to do as a fisherman. After taking Benecta Jannis noticed improvements during his recovery which he couldn't believe.
He isn't limping anymore, the strength in his hand has returned which means he can work with the fish and he is no longer in constant pain. All of which means Jannis can go back to being a fisherman and doing what he loves.