ive jogged mine next to bike and vehicle, i find car the best as you can see what speed and distant you done. i dont allways use tarmac sometimes byways as well especially with young dogs because i think to much on tarmac can damage them long term. its hard on bike especially if a cat runs out in front of you trust me i no, could damage dog or your self lol. ive just got a double dog walker now though so should be abit easier, will mix it up though and still jog em out of motor. i think free running good on open land as well, when there sprinting ect.