Executing a proper lunge involves several steps: 1. Stand upright with your feet shoulder-width apart. 2. Take a step forward with your right foot, lowering your hips until both knees are bent at about a 90-degree angle. 3. Ensure your right knee is directly above your ankle, and your left knee is hovering just above the floor. 4. Push back to the starting position and repeat with the left leg. Proper form is crucial to avoid injury and maximize the benefits of the exercise.