Animation Timing

Here is an animation I did a few years ago with different timing. the first one is on ones. the second is "exposed on twos.

The third is an example of timing a slow start, and the fourth a slow finish.
The final two examples show how the animation might look if the breakdown drawing was closer to key frame 1 and the second closer to key frame 2. Keep in mind these are crude examples done after the fact. In reality the breakdowns would be drawn there and the inbetweens filled in correctly.