i let my bp(boris) excercise 4 days a week(if it wasnt for feeding i would let him everyday.i do it because hes explorer and jsut loves being able to climb on chairs and stuff istead of moving around a terrarium.i think he prefers to excercise.i even set up obstacle courses for him with pillows and other soft stuff. so ya i think they need excercise just to be able to get out of thier enclosure for a bit