Mashle: Magic and Muscles

Mashle: Magic and Muscles (マッシュル-MASHLE-, Masshuru) is a Japanese manga series written and illustrated by Hajime Koumoto.

Plot
This is a world of magic where magic is used for everything. But deep in the forest exists a young man who spends his time training and bulking up. He can't use magic, but he enjoys a peaceful life with his father. But one day, his life is put in danger! Will his muscular body protect him from the magic users who are out to get him? Powerfully trained muscles crush magic as this abnormal magical fantasy begins!