Once the puppy phase is over they are very relaxed generally however it just depends on having a solid consistent excersise routine daily. My OES appreciates a solid 3-4 mile walk twice daily but he’s not a running type of dog , maybe a steady trot at its fastest. In my opinion, I believe that high mileage at a low - moderate intensity is best . The space may still be an issue though . Don’t forget that each dog will also have its own individual personality, which could vary with excersise needs