Dark Side of Pneuma

 Actually its one of the less bodily abusive trails. Its tight between the spines of rock so tough to carry any speed through it. The most likely problem is jamming a toe and trust me doing that with speed is a/ very easy and b/ very bad news. Now, your bike may be in trouble for sure. Best to stay high in the cassette to keep the rear derailleur out of harms way and a bash guard useful!
If you want a shoulders+back pounding try SHAFT or Special K on a hard tail! Super fast lines on those two and certainly the full Jane Fonda in terms of workout!

 How do your shoulders and back feel after hitting that trail?