Pixie Tricep Training: Building Upper Arm Definition at 80–100 lbs
Pixie Tricep Training: Building Upper Arm Definition at 80–100 lbs
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The back of the upper arm is the most common aesthetic complaint I hear from women at every weight class — but at 80 to 100 pounds, the issue is not loose skin or excess fat. It is the absence of muscle. An underdeveloped tricep on a Pixie frame produces an arm that looks thin from the front and hollow from the side. The tricep is the largest muscle of the upper arm — it makes up two-thirds of the arm’s total muscle mass. Developing it does not make the arm look bigger in an unwanted way. It makes the arm look shaped. Defined. Like an arm that belongs to a body that trains.
I am Xavier Savage, a personal trainer based in Houston, Texas and founder of XPL — Xesthetic Performance Labs. I run in-person training in Houston and online programs through XPL across the US, Canada, and the UK. Tricep development at Pixie weight requires the same principles as every other muscle group: appropriate load, full range of motion, and progressive overload. Here is exactly how to apply it.
Phase 1 — Tricep Anatomy: Three Heads, Two-Thirds of the Arm
The tricep — formally the triceps brachii — has three heads, all inserting at the olecranon process of the ulna — the point of the elbow. Together they perform elbow extension: straightening the arm from a bent position.
The long head is the largest head and the most important for overall tricep mass. It originates at the infraglenoid tubercle of the scapula — a point on the shoulder blade — making it the only tricep head that crosses the shoulder joint. Because it crosses the shoulder, it is most stretched — and therefore most effectively loaded — in an overhead position. Overhead tricep extensions specifically load the long head through its full range of motion. The long head runs along the back of the upper arm and creates the bulk visible from behind — the overall fullness of the rear upper arm.
The lateral head originates at the posterior humerus and runs along the outer side of the arm. It creates the horseshoe shape visible from the side and the outer definition of the arm when viewed from behind. The lateral head is the most visually prominent head when viewing the arm from the side.
The medial head is the deepest of the three heads, originating at the posterior humerus below the lateral head’s origin. It provides force through the entire range of elbow extension. All tricep movements train the medial head to some degree.
For the Pixie archetype: long head development for overall mass and rear upper arm shape, lateral head development for the horseshoe definition visible from the side, and medial head strength as the foundation for all pushing movements.
Phase 2 — Somatotype Application
Ectomorph triceps tend to be long and lean. The long head particularly benefits because longer muscle bellies create a more elongated, visually elegant definition rather than a dense, balled tricep. The horseshoe shape of the lateral head appears quickly on a lean ectomorph frame because little fat covers the muscle. Even modest tricep development produces significant visual change at this weight class.
Phase 3 — Body Shape Breakdown
Tricep development applies consistently across all three Pixie body shapes. The rear upper arm is equally visible on rectangle, hourglass, and pear frames and benefits from the same protocol across all three shapes. Timeline: visible horseshoe definition from the side by week 8 to 10. Full rear upper arm shape by week 14 to 16.
Phase 4 — The Exact Protocol
Exercise 1: Overhead Tricep Extension (Dumbbell, Seated)
Sit on an upright bench. Hold one dumbbell with both hands directly above your head, arms fully extended. The dumbbell is held vertically — both palms cupping the top plate. Lower the dumbbell behind your head by bending your elbows — your upper arms remain stationary and vertical throughout. Lower as far as possible — the dumbbell should pass behind the head level. Press back to full extension by straightening the elbows. This overhead position maximally stretches the long head through its crossing of the shoulder joint, producing the highest long head stimulus available in a single exercise.
Sets and reps: 3 sets of 12 reps. Start at 15 pounds. Add 5 pounds every two weeks. Rest 60 seconds between sets.
Exercise 2: Tricep Pushdown (Cable, Rope Attachment)
Attach a rope to a high cable pulley. Stand facing the machine. Grip both ends of the rope. Position your upper arms against your sides — they remain stationary throughout. Push both ends of the rope down and slightly apart at the bottom — separating the rope ends in the fully extended position maximizes lateral head contraction. Keep the wrists straight. Return slowly to the starting position — elbows at approximately 90 degrees.
Sets and reps: 4 sets of 12 reps. Start at 20 pounds. Add 5 pounds every two weeks. Rest 60 seconds between sets.
Exercise 3: Skull Crusher (EZ Bar)
Lie flat on a bench. Hold an EZ bar with a narrow grip — hands 6 to 8 inches apart, using the angled grip sections. Press the bar up to full arm extension directly above your chest. This is your starting position. Keeping your upper arms completely vertical and stationary, lower the bar toward your forehead by bending only at the elbows. The bar should pass just above the forehead level and the upper arms should remain absolutely vertical throughout — if they rock backward, the weight is too heavy. Press back to full extension. This trains both the long and lateral heads under significant free-weight load.
Sets and reps: 3 sets of 10 reps. Start with 20 pounds. Add 5 pounds every two weeks. Rest 90 seconds between sets.
Exercise 4: Close-Grip Push-Up
Standard push-up position but with hands placed narrower than shoulder-width — approximately 8 to 10 inches apart, index fingers parallel to each other. Perform the push-up with elbows tracking close to the sides of the body. This narrow grip shifts stimulus from the pectoral to the tricep, particularly the lateral and medial heads. Progress to adding a loaded backpack when bodyweight becomes easy.
Sets and reps: 3 sets of 15 reps. Progress to loaded when all sets of 15 feel easy. Rest 60 seconds between sets.
Home Alternative
Overhead extensions with a resistance band anchored overhead substitute for cable. Skull crushers with resistance bands anchored underfoot. Close-grip push-ups require no equipment. A complete tricep home program is possible with bands and bodyweight.
For complete arm development, train triceps in conjunction with the Pixie Biceps protocol. For complete upper body integration, review the Pixie Chest protocol — all pressing movements train the tricep secondarily. Take the XPL Archetype Quiz when your weight moves above 100 pounds.
Phase 5 — Timeline, Signs, and When to Switch
Week 1: Tricep soreness at the lateral elbow and behind the upper arm after the first skull crusher session. The long head particularly will be sore after overhead extensions if it has never been loaded in the overhead stretched position.
Week 4: Tricep pushdown weight increasing. The arm looks firmer when viewed from behind. The horseshoe shape beginning to appear at the lateral head.
Week 12: Visible horseshoe definition from the side. Full rear arm shape from behind. Arms look developed at rest — not just when flexed. The overall arm appears significantly more muscular than week one, in combination with bicep development from the biceps protocol.
Signs it is working: strength increases on all exercises. Arm looks different in photos at weeks 4, 8, 12. Pressing exercises feel stronger as tricep strength transfers.
Signs it is not working: no strength progression after six weeks. Check caloric intake — building any muscle requires a surplus. Also confirm you are reaching near-failure on the last 2 to 3 reps of every working set. If every set feels comfortable, every set is producing endurance adaptations, not growth adaptations.
I train clients in person in Houston, Texas and work with people across the US, Canada, and the UK online through XPL. Take the XPL Archetype Quiz to get your exact protocol, or visit xperformancelab.com/plans-pricing to work with me directly.
The standards behind the standards. — Xavier Savage, XPL Xesthetic Performance Labs, Houston, TX
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Xavier Savage
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I do not shape muscle. I shape structure. The person you become is the person you construct.
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