5. You skip weight training.
More than 80% of women forgo strength training, says a survey by the Sporting Goods Manufacturers Association. If you’re one of them, it may be the No. 1 reason your scale is stuck. You’ve probably heard that strength training can boost metabolism, but here’s something you may not know: People who pair aerobic and resistance training eat less—517 fewer calories a day—than those who do only cardio, reports a study in the Journal of Sports Science and Medicine. The combo workouts may increase satiety hormones and boost your body’s ability to break down food and stabilize blood sugar, so you feel full longer, says study author Brandon S. Shaw, PhD.