That was not big in my day.....it was more along the line of "Challenge your limits, don't limit your challenges." Also another big one was....If it isn't hard then it isn't worth it.
The big reason why the Marines don't like the "Pain is weakness leaving the body" is because being shot is painful, oh well I am done rambling.
Physical training = hard-> therefore worth it, etc. You guys know what I mean.
I really can't imagine a slogan like 'If it isn't hard then it isn't worth it' catching on with British squaddies, well, not without howls of laughter anyway but maybe it's our sense of humour!
This is the only way I can learn kata! I tend to teach it that way too.