Which of the following actions is detrimental for a personal trainer during sessions?

Using a phone to text during training sessions interrupts the flow of communication and the overall focus needed for effective personal training. It can create a barrier between the trainer and the client, making the client feel undervalued or unimportant. This distraction not only hinders the trainer's ability to provide proper guidance and support but also diminishes the quality of the training experience. Engaging fully with the client is crucial for creating a positive environment where the client feels encouraged and motivated to reach their goals. Effective personal training relies on building rapport and ensuring that the client's needs are being met without interruptions from external distractions such as phone activity.