backstretch

Short definition from Wiktionary

Noun

1. 1
   Synonym of back straight (“straight part of a racetrack, running track, etc., opposite the finishing line”).
2. 2
   An area next to a racetrack used to stable the racehorses and house employees.
3. 3
   The middle part of an event.
4. 4
   An exercise that stretches the muscles of the back.