Simplify the following text for a Grade 5 native English-speaking person.
Original: There also was a 2.281 km warm-up loop called Zielschleife ( `` Finish Loop '' ) or better known as Betonschleife , around the pit area .
Simplified: There also was a 2.281 k warm-up loop called Zielschleife ( `` Finish Loop '' ) or better known as Betonschleife , around the pit area .