pants size
I agree with the body fat % comment. You can get a good gage of how much fat vs. lean muscle you are losing with body fat % tracking. The scale alone won't tell you this. It also gives you another way to measure success if the scale isn't moving. For example, maybe you're building more muscle and losing fat but your weight stays the same. I'd say that's a great week!!! Most trainers say that muscle burns more calories than fat when at rest (and thus can accelerate weight loss). Another 2 cents: when you keep losing, the pant sizes will go down. For me, most of my weight initially was in a couple places, legs, butt, chest and arms (no big gut). I know it's unusual, but that is how I was distributed. As a result, my pants and shirts have shrunk the entire time I've been losing weight. Take care.