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Waterbars
Quarry Road Track: The famous waterbar punctuated descent
The meeting times are 'ready to ride'. If you need time to prepare equipment then please arrive a few minutes earlier.
End of Stewart Ave, Hornsby
This ride quite literally has its ups and downs. The upside is the great downhill blasts on either side of the creek, but of course, what goes down must go back up 
But despite this, you'll get your fitness workout, as well as have some great views of Berowra Valley Regional Park, as well as see the grand old bridge at the bottom.
Won't go to much more detal - just look at the description of the track on the site... it says all you need to know.
BE WARNED: YOU NEED A GOOD DEGREE OF FITNESS TO ENJOY THIS TRACK!!
But once you can do the uphills, it's all great fun 
Berowra Firetrail
The meeting times are 'ready to ride'. If you need time to prepare equipment then please arrive a few minutes earlier.
Corner of The Gully Road and Berowra Waters Road
SADLY, THE WEATHER IS TOO UNPLEASANT AS OF SUNDAY NIGHT, AND SEEING AS THE TRACKS DON'T WEATHER WELL (AS IN, GET FULL OF PUDDLES), I'M GOING TO HAVE TO POSPONE IT TO ANOTHER DAY
If you went with me a couple of weeks ago, it's the same as what we did then.