what is heart fitness ? Heart fitness, also called cardiovascular fitness or cardiorespiratory fitness, refers to how efficiently your heart, lungs, and blood vessels deliver oxygen to your muscles during physical activity—and how well your body uses that oxygen. 💓 In Simple Terms: Heart fitness = How strong and efficient your heart is at doing its job. 🧠 Why It Matters: A fit heart: Pumps more blood with fewer beats Recovers quickly after activity Maintains healthy blood pressure and circulation Lowers your risk of heart disease, stroke, and high blood pressure Boosts energy, stamina, and mental clarity 📊 How It's Measured: VO₂ max: The maximum amount of oxygen your body can use during intense exercise (a key metric for heart fitness) Resting heart rate: Lower RHR usually = better heart fitness Heart rate recovery: Faster recovery = stronger heart 🚶♂️ Signs of Good Heart Fitness: You can walk briskly or climb stairs without getting winded. Your heart rate drops quickly after exercise. You don’t feel chest pain, fatigue, or shortness of breath with moderate activity.