I recently pulled a muscle in my arm and its pretty painful. i can't fully extend it. how can i get it to extend in a short amount of time?

Triceps tendon tear: Triceps tendon rupture is an injury that occurs to the triceps tendon in the back of the elbow. This commonly occurs from forced bending of the elbow during a pushing activity which can cause the triceps attachment to separate from the bone. A normal triceps tendon is connected strongly to the bone and is responsible for elbow straightening (extension) strength.