What type of muscle fibers does aerobic training chiefly work?

The appropriate response is Slow-twitch red and Fast-twitch white. Individuals have two general sorts of skeletal muscle strands: slow-twitch and fast-twitch. Slow-twitch muscles help empower long-perseverance deeds, for example, separate running, while fast-twitch muscles weakness speedier yet are utilized as a part of effective blasts of developments like sprinting.

That would be a working theory.