Lay sideways on an incline bench and press the elbow of the working arm into the bench.
Use your free arm to pull your upper body into the bench.
Break at the elbow until your elbow is fully flexed, then extend your elbow until the dumbbell is pointed at the ceiling.
Руководство по Упражнению Dumbbell Bench Braced Single Arm Overhead Tricep Extension - Тренировка Triceps | MuscleWiki