My 7-year-old son recently ask to run in a local 5k road race. I took him for a 3-mile training "jog" to ensure he could complete the distance and then signed him up. After forcing him to run slowly the first1.5 miles with me I let him go ahead of me and he completed in 27:32.... Two weeks later he ran a second 5K with me. He left me at the starting line, totally pacing himself and finished in 25:33. Mind you he has not been "training", just the exercise of an activw 7-yr-old at play. Is this a good time for his age. He is excited and living it. I want to encourage him but not pressure him or risk injury. Any advice?