Hi, I read your post and I have only one question for you... Has your son been tested for Scoliosis? I myself have been diagnosed with Scoliosis and I have never been able to touch my toes. I'm an 18 year old female and I am reaching out to those who may have Scoliosis. Please feel free to write back if you have any addition questions. I'm not saying that I think your son definitely has Scoliosis, but I do want to put it out there that Scoliosis may be what is causing your son to not be able to bend that far. I hope this has helped in some way. Take care!