As others have said, it is important to bend at the waist and maintain good shoulder alignment, or the magic “T”, as it is called. However, it is also important to take the angle into account when aiming, because the trajectory of the arrow is based on the horizontal distance to the target rather than the line of sight distance. So for example if you are shooting down out of a tree stand at a 45* angle, you should aim as if the distance were the horizontal distance from the base of the teee to the target. For me at least, this means I have to compensate by aiming about 6” low on a deer sized target at 20 yards line of sight distance. As with everything, nothing beats practice under the conditions you’ll be shooting, as YMMV.