If I don't change my diet at all, will doing the 20 minutes make a difference? I don't eat that bad, I'm pretty balanced with good and bad. I'm trying to take off the last 10 lbs of baby weight, so I started the treadmill about 2 weeks ago and do 20 minutes a day. Do I need to kick it up, or will this gradually take off the 10 lbs? what do you think?