I’ve recently been in the same situation at my facility. I had a meet & greet with the new clients, discussing their goals and what they can expect from me. I also performed a quick assessment and evaluated their movements during our first training session. The evaluation was informal, basically taking them through basic but fundamental movements such as the squat, push-up, plank, lunge, and a form of row. The evaluation helped me get an idea of imbalances, tightness, and weak points if any. And before getting started with our sessions I did tell all clients to forget what they did with their past client as each trainer has different styles of training. This was no to be rude or disrespectful, but to allow us to start from a clean slate, helping vanish any comparisons amongst myself and their old trainer.