Which general approach is suggested for conducting a lesson involving exercise?

The suggested approach of demonstrating, observing, commenting, correcting, and then asking questions aligns well with effective teaching strategies for engaging students actively in a lesson that involves exercise. This method encourages initial demonstration of the exercise to ensure students understand the objective and proper technique.

Observing students as they practice allows the instructor to identify areas where individuals may need additional support or clarification. Commenting provides timely feedback, which reinforces positive actions and informs students of areas for improvement. Correcting is an essential part of the learning process, as it helps students develop skills and ensures they understand the material accurately. Finally, asking questions promotes student engagement and encourages them to think critically about what they are learning, facilitating a deeper understanding of the exercise.

In contrast, lecturing without student interaction may limit students' learning opportunities and does not allow them to apply the techniques effectively. Allowing students to do as they please could result in the development of improper techniques without guidance, which could be detrimental to their learning. Focusing solely on correcting mistakes might lead to a negative experience for students, as this approach does not acknowledge their successes or encourage exploration and learning. Overall, the comprehensive approach outlined in the correct option provides a balanced framework for effective lesson delivery.