Since Max was 6 and started playing sport, I have had to instruct his coaches that Max is never to stretch, ever.
Kevin Bartlett played 402 AFL games, couldnt touch his toes, never did a hammy.
Andy has got this right.
Dr Mauro Di Pasquale has an interesting article on why stretching is a bad idea, before, during and after training.
Any stretching before training, that is outside the exercise ROM can create micro tears and loose joints
Stretching does not reduce soreness.
Empty bar exercises should be your warm up, no need to go beyond the ROM.
For the record, Max has played around 600 games of soccer, basketball and cricket without a single soft tissue injury, ever. He has never pulled a muscle in the gym either.
He cant touch his toes. Either can his dad. Or his brother.