How to Do Tricep Extension - part of the women's fitness video series by GeoBeats. Hi, I'm Linda with Fitness 19. I'm going to show you how to do a Tricep Extension. There are variations to this exercise, this is one. You have to put your hand up over you head, bring that elbow down. Take that arm all the way back behind you. You can take your left hand, with other hand that you're doing, and put it across your chest. You can put it down to your side, whatever you chose to do. You want to take it up, a full extension, all the way down. You're working that tricep, here this way, and all the way back. Make sure you have that bend in your knees because you want to make sure there's no pressure in your lower back. And you're going to switch it around to the other side. Same thing, keep your hand down by your side, or you can put it across here. One thing you want to make sure, you never hit your head. Because once you'll do,you'll never do it again. And that's how you do, the Tricep Extension.