Well, when it comes to cartoon muscles flexing, you'll notice that they often have a sort of exaggerated size and definition. It's a way to visually convey superhuman strength or a show of might. Also, the shading and highlighting are used to give a 3D effect and make them look more impressive.
In a cartoon of a strong man flexing, you'd likely see a defined body with bulging muscles, maybe a fierce look in his eyes to show his power. The background could be simple to focus on the man, or there might be some symbols of strength around him like weights or trophies.
Blade Fangs was a Japanese manga created by Itagaki Keisuke. There were four works in total, namely Grappler Blade Fangs, Fanma Blade Fangs, Blade Fangs Path, and Blade Fangs Path 2. The theme of this manga was hand-to-hand combat, and it told the story of the young Blade Fang fighting with strong enemies in various underground arena competitions. The characters in the Blade Fangs series had distinct personalities, compact storylines, and unique styles. This series of comics was well-known in China and was welcomed and loved. The animated version of Blade Fangs also had two seasons and could be watched online. As for the viewing order of Blade Fangs, they could be viewed in the order of Blade Fangs 1, Blade Fangs 2, Fanma Blade Fangs, Blade Fangs Path, and Blade Fangs Path 2.
Another alternative could be college bodybuilding or strength training success stories. These can be about students who start from a relatively unfit state and transform themselves into healthy, strong individuals through proper diet and exercise. They can inspire others to take care of their bodies in a non - sexual way.