Why does it hurt when I ride my bike?

Incorrect saddle height and handlebar height/reach can cause your weight to be poorly distributed or lead to excessive rocking in the saddle both of which can contribute to discomfort. Leg length discrepancies are another common cause of saddle soreness and should be picked up by a professional bike fit.

FASCINATINGLY:  You asked: Is the trek Marlin 5 a trail bike?