Final answer:
The first step when a client struggles with a multi-joint exercise is to modify their exercise form to ensure safety and effectiveness. Increasing exercise intensity or volume should only be considered after form has been corrected and mastered.
Step-by-step explanation:
When a client has difficulty performing a multi-joint exercise correctly, the first step you should take is to modify the exercise form. It is critical to ensure that the client has the correct form to prevent injury and to ensure the effectiveness of the exercise. Before considering increasing the exercise intensity or the volume (adding more sets and reps), or changing the exercise completely, the client's technique should be assessed and corrected as necessary. This may involve providing cues, reducing the weight, or practicing components of the movement. Effective modifications may lead to improvements in the client's ability to perform the exercise and pave the way for future increases in intensity or volume when appropriate.