Burn my Calories 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

I'm so invincible that everyone calls me Big Daddy! How dare someone call me his Stepford wife? Me, I weigh half a ton! I can fight! I'm invincible! I root out the strong and support the weak! I'm the protector of all the boys in the school! However, one day, I got thinner and weaker... But I became handsome...