Thanks for pointing out the obvious, you say? Sorry, but it needs to be said.
So often I see people weighing themselves on a weekly, or even daily, basis. The scale doesn't budge or it goes in the opposite direction and they get frustrated. I've heard people call the scale a liar, tell me it's broken, and emit noises that made me think I was T-2 seconds away from putting my first aid training to the test.
Same goes for the guy who's been doing the exact same workout for the past ten years. He trudges along on the treadmill at the exact same speed with zero incline, usually for 30 minutes. He then hops on the same six weight machines and sets them to the same weight he always uses. A final round of 100 crunches wraps things up. And yet, his fitness level still leaves him sore after a day of yard work and he's thrown out his back getting in and out of the car.