I am new to cycling and have recently started to bike to work.
The distance is about 20 kms each way and I find that by the end of it my lower back starts to hurt.
I do work at a desk job and I probably do already have a bad sitting posture; which I'm trying to correct.
I was wondering what is the proper posture to ride on a mountain bike comfortably for about 1 hour ride. Or if this lower back pain is due to my back simply not being strong enough to lift my upper body as I'm sitting on the bike.
I'm looking for rule of thumb tips such as your seat should be high enough so that your leg is just reaching the pedal at a full extension.