Can Challenging Classes Also be Enjoyed? Because enjoyment of academics increases intrinsic motivation, it also has the potential to facilitate learning. However, an optimal learning environment is not only enjoyable but also challenges students to fully use and improve their skills. We examined the relationships between challenge and enjoyment in fifth-grade mathematics classrooms. Results indicate that provision of choice positively affects enjoyment, and interest in the material mediates the relationship between challenge and enjoyment. Thus, challenging learning environments can also be enjoyable, provided the material fits studentsí interests and goals.