You can find a brief description of the four areas of wise (right) effort in the following link from Insight Meditation of the South Bay: Four Right Efforts.
Similar to the quote from Greg Kramer, Christina Feldman describes the benefits of learning to dwell in joyful effort in our practice. This means not approaching our practice with a sense of grim determination. She says that “Meditation is never meant to be approached as an ordeal, a grim task of chipping away at a rock face.” You can find her article here: Making a Joyful Effort.