Well, I just got back from a Tim Horton's run (yum!).
Along the way, I decided to "test" my Benchmade Griptilian trainer.
Results:
-in the "Hanging Weight Test", the spine of the knife can support the weight at least one stabman (170 pounds) [used to do chin-ups on tree limb]
-in the spine whack "test", it can safely handle at least 20 hard, VERY hard, wood-denting whacks with no noticeable effect on the knife.
(disclaimer: I still consider spine whacks idiotic, but this is a
trainer, so I routinely beat the hell out of it)
Conclusion: well, I guess it won't "prove" anything to anyone else, but I'm satisfied.