Nothing better in this life than to have your son/daughter walk the trails with you. Sore back or not.
SC/ O: Since you said your son has difficulty blood trailing. What's that old say'in "Necessity is the mother of all inventions." Your young man there will most likely adapt to doing it in another way in his own time. All in all your son is off to a good start thanks to his parents. My congrads to your Son on a job well done Sir.
SS/McG