

Not even. There is no evidence for special training. Their battle record was average and their reputation mostly manufactured. This entry of a blog series on the myth of Sparta dissects that particular justification frequently offered for all the inhumanity laid out in the preceding posts.
I mean, they certainly didn’t lose any battles that one time Phillip II of Macedon marched in… because they never offered any and just let him take what he wanted. Can’t lose if you never fight, right?