A lot of beginner animators wonder about when to use IK or FK. Often experienced animators tell them something like 'With FK you get arcs for free'.
But what does that actually mean?
Here's a clip from one of my live Twitch animation demos where I tried to explain this and think I found a pretty good way to illustrate it in a quick and clear way.
Tune in to watch me animate live in Maya here - twitch.tv/brian_horgan_animation
Cast:Brian Horgan