One thing to remember is that a lot of the tricks and fixes you use for biceps can be used for triceps as well as long as the elbows is pin to the side and the shoulders down and tight, that can be apply for triceps especially when you are doing extensions, you need no equipment to get the result you desire just Position your hands shoulder-width apart on a bench or stable chair your fingers should be at the edge of the bench, facing your heels. With your legs straight out in front of you, position your feet so that your hips just barely touch the edge of the bench and your arms are completely straight.