Accelerated Development

Accelerated Growth Rate is the ability to raise ones statistics, skills, or abilities faster and more effectively than should be possible.

Overview
The user is able to grow stronger and faster through fighting or training, improving their natural abilities far faster.

Saitama has shown to become unbelievably stronger during his training. According to Genos, Saitama himself cannot explain the secret behind his strength, and the cyborg believes that it shouldn't make him that strong with that level of training.

Garou's usage of this ability is at an incredible degree, as he quickly gets stronger with every fight he is in, being able to quickly adapt to his opponent's fighting styles. His usage of this ability is enhanced even further when he begins to transform into his half-monster state, going from struggling against Royal Ripper to being capable of defeating the monster in a single attack. During his fight with Monster King Orochi, Garou showed to become faster the longer he fought and only being subdued when his opponent is utterly and completely on a different level. When battling Superalloy Darkshine, a very powerful S-Class hero known for his remarkable strength and overwhelming durability, Garou initially could not even injure the hero and had difficulty keeping up with him. However; as their fight went on, noted by Darkshine himself, Garou repeatedly got stronger and faster, and eventually surpassed Darkshine in both power and speed, as well as being able to improve his martial arts fighting styles to a higher level, allowing him to completely overwhelm the hero.