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Originally Posted by Ashley829
I have bigger arms too. I am down to 135 now, but I still think my arms are just big! I have done a lot of weight training with my arms so they have toned up, but they honestly haven't really lost many inches, maybe 2. With weight loss the size with go down and they will tone up of course, but I am starting to wonder if it's more of a genetics thing at this point. If you find the secret let me know. lol
It's body fat percentage. That is, if it isn't all in your head.

I've been weight training for decades, and you'd think that would have made my arms look svelte, but that didn't actually happen until I lost enough fat. And, since everyone's body is genetically programmed to lose the fat in its own way, there's no telling where the sweet spot is.
As for focusing on cardio, it's generally held to be diet first, weight training second and cardio third, especially if you believe in squats and deadlifts and lunges and the like, the kinds of exercises that work the largest muscles in your body and therefore help you burn the most calories when weight training. And, well, if you weight train, you also end up with lean muscle instead of just lean arm. As to that, it depends on what you're going for. It's a fallacy to say that you should not focus on your arms if you want to look leaner. You absolutely can focus on your arms—you can, and in my opinion should, lift weights—but you won't see the wonders of your efforts until your body fat falls enough.