Calcium. You need it for muscle contraction—including your heart-pumping ability—as well as bone formation and strength and blood clotting. Aim for about 1,200 milligrams a day.
Potassium. It helps strengthen nerve impulses throughout the body—including the muscle—and controls blood pressure. Try to get about 4,500 milligrams a day (most Americans get only about half that).
Magnesium. It also helps muscle and nerve function and is considered an energy and immune system booster. Plus it helps improve calcium absorption and regulate blood sugar levels (to fight against diabetes). Shoot for about 400 milligrams a day.