Mostly when I play I try to keep my wrist quite straight, because it's the most comfortable and natural-feeling. But when I do long stretches my wrist gets forced into an uncomfortable bent position. It doesn't feel great and I worry a bit that this could lead to injury in the long term? So A) is this a rational fear? and B) is there anything I can do to prevent my wrist bending? If I fret say, the low E on the 3rd fret and the D on the 7th fret it seems impossible to keep my wrist straight and relaxed.