My Dad does this with adults running marathons; it’s way more involved than just running with someone; the visually impaired person sets the pace so you have to run a marathon while someone else decides how fast to run, while also trying to anticipate their stride a few seconds in advance so you can spot potential hazards then communicate them back to your partner who needs to have absolute trust in you that you are going to keep them from hurting themselves. You essentially end up being a rally car navigator for a person