'I Did Natalie Portman's 'Thor' Arm Workout For A Month—And My Arms Have Never Been More Toned'

I learned a *lot* about my body in the process, too. I’ve always been self-conscious about my arms. I have broad shoulders and build muscle quickly, so I generally shied away from lifting weights in the past. An outdated refrain echoes in my head: You don’t want to get *too* big and muscly. It didn’t …

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