His sons practiced sales calls with Grok playing the customer

He runs a family business and used Grok to write cold-call scripts for it. Then his sons practiced the calls, with Grok playing the person being called and giving them feedback after each try. Practicing on an AI is low stakes: you can repeat the hard parts, like the first ten seconds or a customer who says they're busy, as many times as you like before calling a real person. It works best when you tell the AI who you're calling, what you sell and the objections you usually hear, so the practice sounds like a real call. A script is a starting point, so change the wording until it sounds like you.