I have been told that when teaching regular gym goers (rather than aspiring powerlifters) to bench one should teach flat bench. I have been told that the reason for this is that arching for bench puts (bad) stress on the back.
I asked who had hurt their backs arching for bench press.
(I know people hurt their backs squatting and deadlifting and tear their pecs benching but I never heard of anyone hurting their back arching for bench).
They couldn't say.
So I figure the burden of proof is on them.
I wonder if it is like the foot... The arch helps to distribute the load so it is actually fairly safe to arch. Thoughts? Pertinent references?