If you’re searching for a personal trainer you can’t cancel on, look no further than your canine companion. True, he can’t bark orders at you to push out more reps or pick up the pace but it’s hard to resist those puppy-dog eyes. In fact, researchers in England found that dog owners spend six times as much time being active as people without a pup. Morning and evening walks add up to almost 50 minutes of cardio a day – burning up to 710 extra kilojoules.