We divide the colored boulder area into four sections. You can find 30-40 boulder in one section, and we change the routes in two sectors every two weeks. This means that you can find 130-150 boulders in the gym at any given time,each boulder stays for 4 weeks,but you can find 60-70 new problems every two weeks! We selected the sectors to contain multiple styles, so everyone can finds his or her favorite. The "random" wall is changed every 2 or 5 months.