Race Comment Explainer

Original comment with matches highlighted:

in rear, headway well over 4f out, went 5th 4f out, pushed along well over 2f out,

Matched phrases & meanings

Phrase	Meaning
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
One pace	The horse maintained its speed but could not accelerate or quicken.
Headway	The horse was moving up 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).
The horse maintained its speed but could not accelerate or quicken.
The horse was moving up through the field.
Running near the back of the field.