Blaze Ryu isnt in Naruto their explanations dont apply.anyhow it clearly states that his and Rachel's inhuman strength come from the fiend blood.
But you can say Chakra. Chakra is the same thing as Chi, a.k.a spiritual energy. And Taijutsu doesn't equate to just Naruto:
Taijutsu(体術
?, literally "body technique" or "body skill") is a Japanese blanket term for any
combat skill, technique or system of martial art using body movements that are described as an empty-hand combat skill or system. The term is commonly used when referring to a traditional Japanese
martial art but has also been used in the naming of modern martial arts such as
Bujinkan Budo Taijutsu. More specific names than Taijutsu are typically used when describing a martial art, such as
Jujutsu (focusing on grappling and striking),
Judo (focusing on throwing and grappling),
Aikido(focusing on throwing and joint locks) as well as
Karate and
Kenpo (focusing on striking).