Race Comment Explainer

Original comment with matches highlighted:

rear of mid-division on inside, pushed along and over 3f out

Matched phrases & meanings

Phrase	Meaning
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Mid-division	Running in the middle of the pack.
Weakened	The horse lost speed and dropped back through the field.
Rear	Running near the back of the field.

Summary

The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Running in the middle of the pack.
The horse lost speed and dropped back through the field.
Running near the back of the field.