Angle of the saddle, saddle height, back too far, top tube too long..... If you choose to adjust yourself: - Saddle should be level - Saddle height, leg barely bent at the bottom of the pedal stroke, (too high and the hips will rock side to side - Those huge cushy saddles might look comfy but they set your hips at a bad angle - I suggest that you set the mid way on it's front/back adjustment to start - Top tube/stem length ought to be where your view of the front hub is blocked when you are in the drops. Too long will extend you out too far.. Tweak it to fit the rider after that.
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