First, good luck on your weight loss journey! You can do it!
As for your questions...
Just burning calories doesn't help if you aren't lowering your calorie intake, too. You have to cut back by 3500 calories to lose a pound a week. Your body naturally burns calories just sitting there. So, if you need 2000 calories to maintain your current weight, then you need to cut back by 500 a day to lose a pound. So, you can either eat 1500 or eat 1800 and exercise to burn the other 300 away each day. If you want to lose two pounds in a week, then you should drop your weekly calories by 7000, or 1000 a day. So, if you need 2000 calories to maintain your weight, then you can drop it down to 1300 calories and day and burn off the other 300 with exercise. Ahh, math... Then again, this is the way it is supposed to be. Sometimes our bodies think differently. So, just because you burn 300 calories today, doesn't mean you'll see a pound gone tomorrow on the scale. My weight goes up and down each day. Sometimes I'll be the same for three days in a row, sometimes I'll be down two, then up one, then down three, then up one, then up three. Just depends. The trick is to weigh yourself once a week at the same time on the same day in the same clothes (or naked). ;-)
I walk or do some sort of cardio every day, but I only do strength training every other day. It gives my muscles time to rest in between.
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