My bullie is very active. We usually go on 3 to 4 walks a week. The walks normally take about 45 min and we will do a mix of walking a jogging. Now that it gets dark early and is pitch black when I get home from work we normally play tug o' war in the back yard and fetch every night for about 30 to 45 min. I have also had him on 4 to 5 mile hikes and he does fine. Just bring a lot of water and keep an eye on them.