A tricep extension is a good way in order to strengthen your triceps. Your triceps make up a great portion of your arm, so if you are looking to improve arm strength, start with your triceps! Most people who are diligent in the gym tend to only focus on getting their biceps bigger, since this is the area a lot of people want to get big the fastest. However, by improving your tricep strength you will notice improvements. This exercise is demonstrated by the picture below, but the key to the workout is to fully extend the rope all the way, rather than going almost all the way.