Fine then. But what about Aku's daughters? If you seen the episode for Season 5, you can see that they were moving so fast that they appear to be running at superhuman level (if not high levels), like a blur that is overwhelming Jack until he beats them.
Wait one more thing. Remember the episode when Samurai Jack was able to survive getting crushed by Sumoto who weighs 700 tons, if he manages to surive it without any protective equipment, how can a peak human like Jack survive it, to be fairly honest that is boderline superhuman. In fact, that should be on his endurance section or creative a section that says something about his survivability.
Okay, Jack may need to use his tactian to escape but still if people were in the same situation as Jack was in,they will more likely would instantly die soon as Sumoto land on them. But Jack he is exceptionally durable to even survive under extreme stressful conditions.