I did a solo ride at Fountain Head couple Friday's ago. Yes, I took off work to go riding. Did 3 laps and 4000 feet of climbing. This is a pretty tough trail. The trail is filled with a lot of roots and a lot of hills. The hills are tough because several are steep and have roots and loose dirt/sand mixture. Unfortunately, this place has gotten worse over the years and starting to erode badly so more roots are appearing making it a less smooth ride (especially for rigid bike). It's still a great place for good hard technical ride and still a favorite trail for a lot of people. So check out the video. There is a new feature I didn't see before around the 3:30 mark.
Make sure to switch to high res for best video.