I think most people take supplementary training out of context. Doing weights, core, trx, rings, etc, etc is not supposed to make you stronger or better than me it's supposed to make you stronger or better than you, than you would be without doing them.
I see exactly 1 exercise with the kettleball Paul. And to me, it seems that these people with a physical trainer, in the usa or elsewhere are crushing way harder than you.
I will attempt to find evidence to back this up over the week.