In hand-drawn animation, it is very common to animate an action, then slow into a pose and hold the drawing of that pose for several frames, then move into action again. Being two dimensional animation, the action stays alive even with the use of held drawings. The same goes for puppet and clay animation. But in 3-D computer animation, as soon as you go into a held pose, the action dies immediately. I’ve seen it happen with every animator that came out of traditional animation.
It must be the combination of the dimensional, realistic look and the smooth motion (usually on "ones") that makes a hold cause the motion to die. The eye picks it up immediately, it begins to look like robotic motion. To combat this, use a "moving hold." Instead of having every part of the character stop, have some part continue to move slightly in the same direction, like an arm, a head, or even have the whole body.
Even the slightest movement will keep your character alive. Sometimes an action that feels believable in traditional animation, looks too cartoony in computer animation. Because of the realistic look of computer animation, an animator need to be aware of how far to push the motion. The motion should match the design of the character and the world. Animating very cartoony motion with lots of squash and stretch on a realistic looking object may not look believable, as would realistic motion on a caricatured object.
This is the pitfall of using motion capture devices to create final animation. Motion capture from human actors will always look realistic... for a human. But apply that motion to a chicken and it will look like a human in a chicken suit. You can use the motion capture data as a starting place, tweak the timing and poses to make it more caricatured, then apply it to the chicken and the motion will match the design of the character.