How to Build Bigger Arms: The Complete Biceps and Triceps Guide

Everyone wants bigger arms, yet most people's arms stall after a few months of curls. The reason is almost always structural: they're overworking the smaller biceps while neglecting the triceps — which make up roughly two-thirds of upper arm mass — and they're failing to progressively overload either. Here's how to fix both.

Anatomy First: What Actually Makes the Arm Look Big

• •Triceps (2/3 of upper arm size): Three heads — long, lateral, and medial. The long head runs from the shoulder blade and gives the arm thickness when viewed from behind. All three heads must be trained for full development
• •Biceps (1/3 of upper arm): Two heads — long (outer, creates the peak) and short (inner, adds width). The brachialis underneath pushes the biceps upward and contributes significantly to arm size
• •Brachioradialis: The large forearm muscle that runs to the elbow. Trained heavily with hammer curls and contributes to overall arm appearance

The Problem With Most Arm Training

• •Too much bicep volume, not enough tricep work: People do 6 sets of curls and 2 sets of pushdowns. Since triceps are larger, this ratio should often be reversed
• •No progressive overload: Curling the same 25 lb dumbbells for the same 10 reps for months. Without adding load or reps, there's no growth stimulus
• •Ignoring the long head of the triceps: Most pushdown variations only hit the lateral and medial heads. The long head (the one that creates thickness) requires overhead extension movements
• •No full range of motion: Half-rep curls and partial pushdowns reduce the effective stimulus. Both the stretched and contracted positions need to be reached on every rep

The Best Bicep Exercises

• •Barbell curl: Allows the most weight and directly overloads both heads. Supinate (turn palms up) fully at the top for maximum contraction
• •Incline dumbbell curl: The inclined position increases the stretch at the bottom of the movement — the stretched position under load is where hypertrophy stimulus is highest
• •Hammer curl: Targets the brachialis and brachioradialis. Use alternating or simultaneous — both work
• •Cable curl: Maintains tension throughout the full range of motion, including the contracted position where a dumbbell loses tension. Use for finishing work
• •Concentration curl: Isolates the biceps and enhances the peak contraction — useful for targeting the long head specifically

The Best Tricep Exercises

• •Close-grip bench press: The gold standard compound tricep movement. Allows heavy loading across all three heads
• •Overhead tricep extension (cable or dumbbell): The only movement that fully stretches the long head — which is critical for training the largest portion of the triceps. Non-negotiable for arm development
• •Tricep dip (weighted): Heavy compound movement that overloads all three heads under load. Add weight via a dip belt when bodyweight becomes easy
• •Cable pushdown (rope or bar): Great for the lateral and medial heads. Keep elbows fixed at the sides and achieve full extension at the bottom
• •Skull crusher (EZ-bar): The long head is stretched at the top; all heads are contracted at the bottom. One of the most effective tricep builders

A Sample Arm Training Day

• •A1: Close-grip bench press — 4 × 6–8
• •A2: Barbell curl — 4 × 8–10
• •B1: Overhead cable tricep extension — 3 × 10–12
• •B2: Incline dumbbell curl — 3 × 10–12
• •C1: Cable pushdown (rope) — 3 × 12–15
• •C2: Hammer curl — 3 × 12–15
• •Rest 90 seconds between paired sets. Track every set in YourFit — arm training responds well to progressive overload logged over time, since the goal is to steadily increase weight on every movement across weeks

Frequency and Volume

Arms can be trained 2–3x per week for most people. Each session, aim for 4–6 working sets per muscle group (biceps and triceps). Total weekly volume of 12–16 sets per muscle group is the effective range for most intermediate trainees. Because arm exercises are low systemic fatigue, they can be trained as a finisher after upper body sessions or as a dedicated arm day.

The Bottom Line

Bigger arms come from: sufficient tricep volume (especially long head work), progressive overload on both biceps and triceps, training through full range of motion, and consistency over months. Most people are one program change away from re-starting arm growth. Log your arm workouts in YourFit and watch your curl and extension weights over 12 weeks — the trend tells you everything you need to know about whether your training is working.