Mike James wrote:"How do you keep your arms and shoulders relaxed while riding?" asked the n00b.
Seem to be forever tensed up. Can't imagine a 2-hour ride....Mike
As others have said, your ergos may be at fault. However, something to look at before even your ergos, is your posture.
Try this: sit on your bike in your normal riding position. You could even be on the center stand. If your arms are nearly straight (and you're elbows are locked or nearly so), then I'd argue that you are sitting too far from the bars and chances are it's because you are
leaning backwards. Having your elbows locked--or nearly so--should tell you that you are sitting in a fatigue-inducing posture that is easily fixable, simply by sitting
up straight. What to do? Roll your upper body (from the hips) forward a few degrees to cause your elbows to bend--they should be bent between 90° and 120°.
If you find that your arms are nearly straight as you ride along (and your elbows are locked or nearly so), then you need to adjust that, and you do it by simply rotating your upper body forward (and just so you know, it happens to all of us, eventually).
When you ride all of your steering inputs should come from your lower arms. If your shoulders are involved in things like turning/cornering, that's a hint that you're leaning backwards. Rotate you upper body forward.
Let us know what you find and how you fix it.