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This is me praticing an animation technique called Slow In Slow Out.
"Slow In and Out. This refers to the spacing of the inbetween frames at maximum positions. It is the second and third order continuity of motion of the object. ... When Ease To is set to a higher value, the motion is faster as it leaves the previous keyframe and slows as it approaches the current keyframes." -Principles of animation
Principles of Animation: Slow in ...