Performing standard Push-Ups with your hands at shoulder-width will strengthen and build your chest, shoulder, triceps, core and abdomen muscles. But if your focus is primarily on increasing your arm size, bring your hands closer together and keep your elbows tight to your sides. The result: bigger triceps. To figure out which muscle is bigger between the triceps and biceps, there are three main methods. First you can look to see which one looks bigger. The triceps will usually appear larger because it takes up two thirds of the upper arm while the biceps take up one third. Second, you can measure each muscle’s circumference by wrapping During arm flexion, the biceps fulfill the role as the agonist, with the triceps as the antagonist. This means that the biceps will contract and the triceps will relax in kind (pictured below). During extension, the opposite is true, with the triceps as the agonist and the biceps as the antagonist – where the triceps will contract or shorten By getting stronger in your compound push and pull exercises. Someone with a 315 bench or a heavy weighted pull-ups will have well- developed biceps and triceps. Go in with the intention of getting strong and pressing and pulling, and the arms will follow. 2. Repulsive_Lettuce. Keep your hands 10 inches apart, and use an overhand grip on the barbell. The idea is to make sure your arms are parallel to the floor. Now bend your wrists forward while lowering the bar as much as possible. Once you’ve reached your limit, bring your wrists back up without moving your forearms. Jeff Cavaliere of Athlean-X shows off a plan to pack on size and strength in just 22 days. If building bigger arms is your fitness goal, you don't have to spend a full extra day in the gym every The average person has about the same size ratio in their upper arm muscles. This holds up in most cases whether the person is an avid athlete, bodybuilder, or even a couch potato. Your triceps tends to occupy about 55% of your upper arm. Your biceps takes up about 30% of the size. If you’re struggling to visualize the exercise, watch Henry demonstrate the triceps push-up with proper form below. A. Start in a high plank position on the floor with hands directly underneath shoulders and legs extended, feet hip-width apart. B. Engage core by tucking tailbone and drawing navel in toward spine. JFGQn6B.