I can tell I'm a western rider:)
If I have a horse not wanting to turn I move my outside heel forward and bump them in the outside shoulder, usually with a spur.
I've also put them in a stall with their head tied around to the rigging on the saddle. Enough to bring their head and neck around but leave enough slack so that if they flex a little more they get relief from the pressure. About 10 minutes each direction.
They'll learn about the only way they can move comfortabley is in a turn, and to give to pressure.
Becky
THAT works. I've seen it used on a horse that didn't want to give to the bit. Didn't take long, either.
That's what my husband does. DIL isn't riding him with spurs right now, although that may be next (hopefully before the baseball bat).
It sodesn't seem to be a matter of him not knowing, nor does he do this frequently. Just often enough to test her patience.