So my public speaking teacher told me I need to be able to do 30 push-ups and 10 pull-ups and that I should get an ab wheel to strengthen my rectus abdominus. Apparently if my body is weak then my posture will be weak and I'll fidget a lot or something, less powerful position due to lack of control of my body and thus visible derogatory body language.
There's this video:
Is this thing any more/less useful than a wheel on a stick? Also the advice about arching your back like that seems dubious to me, but I dunno.
I have no idea how I got here from looking for writing/speaking tutoring, but whatever.