The red-graded Blade trail takes you further out into the forest, rewarding the tough, often technical climbing with views over the Brecon Beacons and cracking technical singletrack decents.
It starts from the Glyncorrwg centre and it's also possible to add in the old Skyline trail for another 20km of distance and 370m of climbing on top of the 23km and 570m climbing of this trail.
You'll need to be properly prepared if you fancy doing that, as it takes you pretty far from civilisation and you'll be exposed to the worse the weather can throw at you - as well as it being fairly arduous.
Afan Forest Park
Trails at this centre