Crunches to split your upper abs! What is the most effective way for beginners to train?

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Crunches to split your upper abs! What is the most effective way for beginners to train?

Profile of Mr. Shumpei Oshima, the personal trainer who supervised this training

Shumpei Oshima is a personal trainer based in Tokyo. He started body building because of his own slender body complex and won the Summer Style Award x Dream in the sports model category in 2017. He is also an expert in improving posture and O-legs, and is a hot personal trainer who has gained tremendous trust from clients of all ages.

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