The Six Traits: Sentence Fluency

One rule for sentence fluency: READ ALOUD. Read it, hear it, make it better. Does it sound like it flows? Is it lyrical?
Every sentence shouldn't sound the same.
Sentence fluency is what you hear aloud and in your head as you read.
Each should have a different amount of syllables than the previous.
For example;
See Spot run. Spot runs fast. "Good Boy Spot." We love Spot. Hear Spot bark.
or
Spot ran, his lean legs pulling him forward effortlessly. He skidded to a halt in front of Jack.
Jack patted his head. "Good Boy."
He cocked his head to one side and barked.

Rubric:
The writing has an easy flow, rhythm, and cadence. Sentences are well built, with strong and varied structure that invites expressive oral reading.