Cara: Welcome to LWL! And, congratulations on losing 84 pounds: that's fantastic!
I don't care for circuit training. If I want to exercise my heart, I do cardio. If I want to build strength, I lift weights. Circuit training is supposed to kill two birds with one stone, but really ends up just wounding both.
IMO, it's more efficient to concentrate on lifting heavy weight with good form on weight training days, and on cardio on cardio days. (Unless you're one of the 1-5% of women who naturally produce a lot of testosterone or are taking steroids, you won't bulk up from lifting heavy.) Moreover, since you can't spot reduce, you might as well get the most bang for your weight lifting buck by emphasizing compound movements that work the whole body (e.g., squats, bench press, dips, deadlifts, pullups or alternative, etc) rather than isolation movements (e.g., bicep curls, tricep kickbacks, etc.) that work just a couple of small muscles at a time.
As for the problem areas, weight training will build muscle and help you lose fat by raising your resting metabolism (slightly). But, until you lose the covering fat, the muscles won't show, and you'll still jiggle. You'll jiggle less than if you didn't lift, and you'll be stronger, but you'll still jiggle. Them's the breaks.
If you're carrying a lot of loose skin from your weight loss, this won't be affected by weight training. Either you have elastic skin, in which case your skin will shrink to fit, or you don't, in which case the only real option to get rid of the loose skin is surgery. (It looks live you've been on 3fc for a while, so you probably know about the many weight loss after surgery threads.)
Still, there's really no substitute for weight training as one component of a healthy lifestyle. We're learning more and more each year about the physiological benefits, especially for women. So glad you found this board, and decided to join up!
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