Lifting weights will help build lean muscle. The more lean muscle you have, the smaller you will be at the similar weight. Fat takes up more room than muscle per pound. Weight/resistance training is important at any weight because you lose 5% of your muscle mass every 10 years as an adult. When you are losing weight, you lose even *more* lean muscle/tissue if you're not weight/resistance training, up to 25-30% of your weight loss. Losing lean muscle will make you flabbier even at a healthy weight. Not to mention all the other wonderful health benefits it provides. It also boosts your metabolism, muscle burns more calories than fat at rest so the more muscle you have the more calories your body will burn naturally.
5 lbs is definitely too light and you shouldn't be using the same weight for all muscles. All your muscles are different sizes and strengths. There is a big difference between your triceps muscles and your quads. To really challenge your quads you're going to need a much heavier weight or resistance.
I'm 5'2 115 lbs and use weights ranging from 20 lbs (bicep curls/tricep extensions, smaller muscles) to 100-200 lbs (bench press, squats, deadlifts, larger muscles).
To grow muscle you need to create microscopic tears in the muscle fibers. When these tears heal is when muscle is grown and you become stronger. Now you *could* do this with 5 lbs weights but it would probably take you hundreds of repetitions to create these tears OR you could use 20 lbs and create these tears in 6-8 reps and around 3 sets. And don't get me started on how long it would take doing 10 lbs weighted squats.
If you don't have access to a gym or barbell to really get some heavy weight. I recommend resistance bands for a beginner. They are affordable and versatile and should provide you with enough resistance to start. Remember you must keep increasing weight/resistance in order to encourage the muscle to grow and to build strength. Next, look into some adjustable dumbbells with plates.
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.
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