The inspo of Michelle Obama’s swole arms has stuck around long past the Obama presidency, and for good reason. A strong upper body is linked to longevity, and assists with essential functions as we age like maintaining balance. Not to mention that toned shoulders, biceps, and triceps look dang impressive on anyone. Liz Hilliard, a 68-year-old trainer and the owner and creator of Hilliard Studio Method in Charlotte, North Carolina, focuses on arm strength for both herself and her clients. And she says that, personally, her arms are stronger today than they were in her 30s, since she added arm resistance training to her workout routine three times per week. “We begin losing muscle mass beginning around the age of 30,” Hilliard says. “While traditional workouts such as cardio and stretching are important, nothing beats resistance training for keeping our bones strong and…