Someone recently asked if running on a flat treadmill (0% grade) was bad. When I questioned a bit further, she confessed to reading an online article that put running on a flat treadmill in the top 7 list of things fitness experts wish you'd stop doing. Being a fitness expert, I was lumped into this group who supposedly thought running on a flat treadmill was bad, worthless, did not 'burn' as many calories, and was even harmful....