If you're trying to burn fat and build muscle you should be eating between 1600-2000 cals a day and cutting back on your cardio (especially if you're having trouble consuming enough calories) to about 30 mins of HIIT 3x a week.
Strength training on 1200 cals while burning that much through cardio is pretty much of waste of time. You're going to lose a lot lean muscle regardless which is in opposition of the goal you're trying to achieve; lower body fat percentage.
If you can't eat more than 1200 cals, how do you expect to maintain your goal weight at 1800-2000 cals per day? I assure you, you can eat and your body will adapt. There's plenty of ways to get your cals without filling stuffed. Eat more healthy fats, introduce some more meals/snacks into the day, drink a protein shake, etc.
I'm 5'2 as well and have 18% body fat at 115 lbs. I eat between 1500 cals- 2000 cals a day with minimal cardio. My cardio is HIIT, circuit training and metabolic resistance training (all contain an aspect of ST). Then a regular ST routine 4x a week.
Take your eyes off the scale. You can buy a skin fold caliper to track your progress for about $20-$30 and use that instead. Cut back on the cardio and eat!!!! :))
Take your focus off the Marshmallow. www.leangains.com/2010/01/marshmallo
"Toning" is marketing muscles to women who are afraid if they pick up a barbell, they'll leave the gym looking like She-Hulk. If you don't want to get bulky, lift heavy!
I can bench Nicole Richie, eat more than she does in a day before noon, I have a good 20 lbs on her but could still wear her pants.
All that matters is that you be the healthiest you, you ca
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