Some lizards enjoy being leash-walked for exercise.
Some turtles and tortoises benefit from being placed in a large, outdoor pen for exercise. But, as strange as it sounds, exercise is very important for some pet reptiles. While the average pet snake, lizard, tortoise, turtle or frog will get enough exercise just walking around its cage, some reptiles will benefit greatly from additional exercise. For example, large boas and pythons often spend their whole lives in fairly small cages. This can be problematic, especially for a breeding female, or a large sedentary adult.