well, he is not a sprinter, he is just an aspiring/amateur sprinter and he definately wants to increase his lower body strg… what do you mean intensive leg training? sth like smolov? that would wreck his body for good..
he just squats once a week and clean once a week too (varying the intensity at squats 80-90% and occasionally testing his 1rm)
you really need to hit legs more then just once a week. i would probably do something like this for 6-8 weeks then switch it up.
back squats 5×1-6reps (add weight each week to the bar)
back squats 3-4×3-5 lighter weight then on mon