Maybe you are either feeling your triceps stretching because they are tight (they are the antogonist to the biceps which are the active muscles, producing movement) or maybe you are feeling a different muscle, such as your brachialles and confusing it with your tricep?
The major motion of the triceps is to extend the elbow joint, the only movement caused by a muscular contraction during a pull up at the elbow is flexion
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