Did you have your client sign an informed consent? I ask this question because there ought to be wording in your informed consent that says there is a risk of injury engaging in physical activity.
I personally would want to know the mechanism of injury. How exactly did the injury occur? I would be curious as a consequence of Wolff’s Law. If it is truly an injury to the connective tissue and not DOMS then you ought to know that:
1. Connective tissue has a physiological limit. Your client may have very been engaged in a repetitive motion and finally reached that “physiological limitation” and injured him or herself. This is why I would want to know “how” the injury happened.
2. As fitness professionals we cannot ever know the integrity of our clients connective tissues and neither do they.
3. The injury could be a consequence of cumulative trauma.
4. Once you know the mechanism of injury, then you will be in a position to know whether you need to modify your program or keep it as it is.
All the best to you.