Track feature of hindbrain that's active with physical education (7,4)
I believe the answer is:
hairpin bend
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for hairpin bend that I've seen before include "Very sharp corner (on road)" , "I may be found on a track" , "road hazard" , "Sharp turn on a road" , "One demanding careful negotiation" .)