Decide before practice that you'll speak to yourself the way a great coach or teammate would. Your goal is to talk to yourself in ways that are supportive, encouraging, and solution-focused.
During:
Replace criticism with instruction. Instead of saying, "That was terrible," tell yourself exactly what to do on the next repetition.
After:
Did today's MindRep help you? How did today's MindRep help you? Do you want to own it and make it a consistent part of your training?