Strengthening the heart means improving cardiac endurance and increasing the efficiency of the circulatory system. The most direct lever is regular aerobic activity—brisk walking, cycling, and swimming support pumping capacity and cardiovascular fitness. Adding resistance training twice per week can further help by improving insulin sensitivity and weight control, which reduces cardiac workload. Nutrition matters: increase fiber, omega-3 intake, and unsaturated fats while reducing trans fats and ultra-processed foods to support vascular health. Blood pressure, cholesterol, and glucose control are measurable pillars of “getting stronger.” Without adequate sleep, recovery, and stress management, fitness gains are hard to sustain. The most reliable strategy is to start small but remain consistent: a realistic plan executed daily beats an aggressive plan that collapses. If you have medical conditions or symptoms, tailor exercise intensity with professional guidance.