"Herakles" is a short insight into the Greek myth about Herakles. We observe hero while training. It is a silent movie and the only words are the subtitles, that are only questions whether Herakles will defeat someone ...展开(they are all connected with the myth).
What can be interesting is that Herakles is shown only physically, actually there is not much time to see his face and his surrounding is rather murky and dark. The questions are asked while Herkles is preparing as if there were some doubts. In the myth Herakles is rather a pure hero, here he gets a quality of uncertainty. He is shown as a motivated and strong, but rather human, however by that I do not mean that Herzog wants to attribute humanity to him. A hero is a man and a god, therefore it would be pointless.
I must admit that I am very careful while rendering Herzog's film. You cannot really say at what he was aiming. It is probably film done in result of experimenting with filming (it is his first film). Probably Herzog visualized his loose interpretation or rather his attitude towards Herakles. This film is not spectacular or meaningful, but is a gracious creation of imagination. The best thing you can to do is to enjoy it for yourself.