20,000 Years of Physical Cultivation is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Wu Linggen, once the chubby kid who was constantly bullied, suddenly dies from a heart attack brought on by his weight, only to awaken in a completely different world. With a fierce determination to finally build a strong body, he quickly realizes that he’s in a realm of cultivation—where those without spiritual roots are deemed worthless. At first, he believes his newfound muscles might just help him scrape by in this bizarre land of monsters and demons. But he didn’t expect that his fists could punch through the entire world of immortal cultivation!