Arms: how to grow your biceps and triceps
Informational content: this is not a substitute for medical advice. Check with a doctor before starting a training program, especially if you have a health issue or any pain.
Arms are probably the most trained muscle in every gym, and yet the most disappointing. Curl after curl, the tape measure will not move. The problem is rarely a lack of effort: it is how that effort is distributed. Here is what actually builds bigger arms.
The triceps, the muscle everyone neglects
Let us start with what changes everything: your arm is not mainly made of biceps. The triceps makes up roughly two thirds of your arm's volume, against one third for the biceps.
The consequence is direct: if you want bigger arms, your triceps deserves at least as much attention as your biceps, if not more. Yet in most sessions the ratio is reversed: four biceps exercises in front of the mirror, and two rushed triceps sets at the end.
Understanding both muscles
The biceps has two jobs: bending the elbow and rotating the forearm upward, known as supination. It also works at varying shoulder positions, which is why different curl variations matter.
The triceps has three heads. The largest, the long head, is only properly trained with your arms overhead or extended behind you, meaning in a stretched position. That is precisely the head most people neglect by sticking to cable pushdowns with elbows pinned to their sides.
The exercises that work
| Muscle | Exercises |
|---|---|
| Triceps, long head | Overhead extensions, skull crushers |
| Triceps, overall | Dips, close grip bench press, cable pushdowns |
| Biceps, overall | Barbell curl, dumbbell curl |
| Biceps, stretched position | Incline dumbbell curl |
| Biceps and brachialis | Hammer curl, reverse grip EZ bar curl |
The hammer curl deserves a special mention: it targets the brachialis, a muscle sitting under the biceps. Developing it pushes the biceps up and makes your arm look noticeably thicker, especially from the side.
What volume should you aim for?
Arms are small muscles that recover fast and handle frequency well:
- 10 to 20 sets per week for biceps and triceps alike.
- 2 to 3 sessions per week hitting each group.
- 6 to 15 reps depending on the exercise, heavier on compounds and lighter on isolation.
Watch out for double counting: your triceps already work on every bench press and overhead press, your biceps on every pull-up and row. Count those sets in your total, or you may accumulate far more volume than planned and recover poorly.
Why your arms are not growing
- You neglect the triceps. Mistake number one, when they make up two thirds of the arm.
- You do not load enough. The biceps responds to progressive overload like any muscle: without more load or reps, nothing changes.
- You cheat with your back. Swinging your torso to lift a heavy curl shifts the work elsewhere.
- You cut the range. Arms straight at the bottom, full squeeze at the top: half reps build almost nothing.
- You do not eat enough. Without a calorie surplus and enough protein, there is no material to grow with.
Arms grow with everything else too
An often forgotten point: big arms almost always belong to people who lift heavy on compound movements. Bench press, overhead press, pull-ups, rows: these exercises load your arms with far heavier weights than any curl.
So do not build your session around isolation alone. Compounds first, isolation afterward to fill in and target.
How long to gain a centimeter?
Let us be realistic: arm circumference moves slowly. Gaining a centimeter often takes several months of consistent work with matching nutrition. Beginners progress faster, but nobody adds two centimeters in six weeks. Consistency beats occasional intensity.
Frequently asked questions
Which exercise builds arms the most?
No single exercise is enough. Dips and close grip bench press for triceps, paired with curls for biceps, form the base. Since the triceps makes up two thirds of the arm, it deserves at least as much volume.
How often should you train arms?
Two to three sessions per week, for a total of 10 to 20 sets per muscle. Remember to count the indirect work from your presses, pull-ups, and rows.
Why are my biceps not growing?
Usually from a lack of progressive overload, an incomplete range of motion, too much cheating with the back, or because your diet does not supply enough calories and protein to build muscle.
Should you do curls every day?
No. Arms recover fast, but they still need rest. Two to three well run weekly sessions beat daily work that prevents recovery.
The real difficulty with arms is that they get a lot of indirect work people forget to count. By tracking your sessions in Musku, muscle distribution shows how many sets your biceps and triceps actually receive, including those coming from your presses and pull-ups. You can then tell whether your volume is genuinely too low, or whether the real issue is loads that stopped climbing.