Race Comment Explainer

Original comment with matches highlighted:

tracked leaders, out, headed to lead over 1f out, headed final ,

Matched phrases & meanings

Phrase	Meaning
Tracked leader	Followed closely behind the leaders.
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
No extra	Did not improve or accelerate when asked.
Furlong	Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).

Summary

Followed closely behind the leaders.
The jockey started to urge the horse (hand-riding, not necessarily using the whip).
Did not improve or accelerate when asked.
Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).