I can't stand cardio.
Hence, I run OUT for a max of about 15 minutes... then walk home. This equals about 45 minutes of being on the treadmill 'cuz it takes my 1/2 an hour to walk back... 45 minute total time.
I can walk dogs easily... find it very fun... and I can ride a bike easily IF I'M GOING SOMEWHERE.
I just can't do cardio for its own sake. It is too boring.
Fortunately, I love boxing and kickboxing. I get in great boxing workouts 4-5 nights a week.