The release arm, (aka the string arm or shooting arm), is the arm/hand that holds the string while drawing the bow. If you are right handed, then it’s your right hand.
In traditional archery you have the option of wearing a shooting glove or finger tab to protect your first three fingers (index, middle, and ring finger). Although it is perfectly fine to shoot with bare fingers on a light-poundage bow, it can be very painful with a heavier-poundage bow.
All modern compound bows should be shot with a mechanical release aid. Unlike traditional bows (longbows and recurves), compound bows are designed to be shot in-line. With traditional bows, the string will oscillate side to side as it rolls off your fingers. This is normal, and the arrow will correct itself in flight. With compound bows, the arrow leaves the bow at a much higher speed and therefore, oscillation will cause the arrow to shed speed and energy as it tries to re-adjust itself in flight. Therefore, the arrow should be shot with minimal or no oscillation. In order to accomplish this, the arrow connects to the string in a D-loop tied onto the string and the release aid attaches to the D-loop. This keeps the shooters arm, release, and the arrow pinch point in perfect line with the arrow and reduces oscillation.
As an aside, my person favorite release is the Fletcher .44 Caliper Release. This is the smoothest, most reliable, and least expensive release I’ve used.
With traditional archery, you have two options for grasping the string: a) one finger above/two below the arrow nock, or b) three fingers below the nock. The advantage to having three fingers below is that it brings the arrow closer to your eye which helps with aiming. I’ve personally found that three fingers below dramatically increases my accuracy. Try both and see what works best.
Click here for the next lesson: Step #4: Releasing an Arrow