Happy, peppy people exercise

A cat that lives outside will alternate between periods of relaxing and sleeping and the hyper-vigilance of killing small rodents, birds and bugs. When you move it into the house, it will be lethargic and sleep and relax most of the time because generally there is not much prey to be had. However, as time goes on, it will start to act crazy. It will often begin to attack table legs and chair legs and walls and feet. It will seem psychotic.