0_Apprentice
I really love mountain bikes, how about you?
1_Wizard
I have a friend that does it - they are a bit different from regular bikes as they are enhanced for durability and performance in rough terrain.
0_Apprentice
That is true, they have special wheels that allow the bikes to perform better on and off trail.  Biking on the beach is off trail too, and that is hard!
1_Wizard
She rides hers mostly on mountain trails, fire roads and other unpaved surfaces.