I practice elbow strikes, and other techniques, first in the air. I just make up impromptu scenarios and respond to imaginary opponents just like forms. I like to practice elbows in one-steps and three-steps with a partner, and in self defense routines where they grab bear hugs, body hugs, and head locks (especially with the hogu and specially designed head protectors).
One of my favorite drills is using the "Bob" bag because it has the torso, and head target, and I can practice close range of all my elbow variations (front, upward, downward, back, side, etc.) with full power. I can practice a kick or hand strike to daze "Bob," then jump forward with a diving front elbow. I also like practicing on rebrakable boards for power and accuracy
CM Eisenhart