"Burn more than you eat" does NOT mean "burn more than you eat in exercise" - it's referring to your overall calorie burn from every single activity you do all day long. Everybody has a BMR - depending on your size, age, and gender, your BMR will be anywhere from, at the very lowest end 1200ish calories, up to, usually 1600-1800 calories if you're tall or very overweight. Your BMR (basal metabolic rate) is the number of calories you burn just by being awake and doing the bare minimum of activity. On top of that, you then add in exercise, and that gives you your total calorie burn for the day. So, for example, if your BMR is 1350 AND you burn 500 calories a day in exercise, your TOTAL calorie burn for the day is 1850. That means that if you eat 1350, you'll be burning 500 more calories than you eat. You absolutely should NOT be burning every single calorie you eat through exercise - that would create a SEVERE calorie deficit that could damage your overall health and metabolism.
Assuming you've accurately reported your weight and the number of calories you burn each week through exercise to SparkPeople, SP will have already done this calculation for you and it'll all be taken into account when SP tells you your range of calories to eat each day.
Plateaus are normal, and they happen to everyone. It's just your body taking a bit of time to adjust to the new demands you're putting on it. The best thing you can do during a plateau is change things up a bit - if you've been eating on the low end of your recommended range, try eating on the higher end for a few days, and try a new form of exercise to create some variation in your routine.
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