This is a short tutorial covering Akuma's Roundhouse Loop in Street Fighter IV. It works against a variety of opponents, but is easiest to connect on characters with large hit-boxes, such as Sagat, Abel, Zangief, and Seth.
This is the first of (hopefully) many shorter tutorials concerning Akuma in Street Fighter IV, this one specifically proposed by a viewer. So if you guys have any questions you want answered and I deem it important enough for a video about it, I'll go ahead and give it a shot when I have the free time.