3 interesting exercises for Scheuermann's

I came across these interesting, non lethal looking exercises , allegedly for Scheuermann’s . I have a couple of occasional clients with this condition, so I’ve sent it over to  test!
I’ll report back.
From  a risk assessment point of view, lying on a swiss ball for 3 minutes, shouldn’t kill you. Nor should leaning against a door, or snoozing on  a towel.