One recommendation given in a study on SI joint issues in athletes was that "exercise techniques that promote independent contraction of the transverses abdominis."
First, precisely which are the transverses abdominis muscles? From what I'm seeing online, they're your lower back, but I'm trying to figure out where they precisely start and end, which way they run, etc.
What are some exercises that you might recommend that focus on strengthening those muscles? Of those, which would be the best ones to minimize neck strain?