To choose a good bodybuilding trainer, look for someone who uses science-based training, like Dr. Mike Israetel. They should understand muscle growth, strength training, and how to make progress over time. A great coach will create a plan that fits your goals and helps you recover properly. Check their experience, past results, and how well they explain things. Most importantly, their training style should match what you want, whether it's getting bigger, stronger, or competing.