Triceps or biceps for bigger arms?

Triceps. They make up roughly two-thirds of your upper arm's mass, so a thick set of triceps changes how your arm looks far more than peak-loaded biceps do. Train both, but if you only have time to prioritize one for size, prioritize triceps.

What's the best triceps exercise?

There isn't a single best one, but an overhead extension is the most underrated because it loads the long head — the biggest of the three heads — in a stretched position. Pair it with a pressing movement or a cable pushdown and you've covered all three heads.

How often should I train triceps?

Twice a week works for most people. That lets you accumulate 10-16 hard sets across the week with enough recovery between sessions. Once a week leaves growth on the table; daily is overkill for a muscle that already gets hit on every press.

How To Build Bigger Triceps

If you want bigger triceps, the honest answer is simpler than most arm routines make it look. Your triceps are about two-thirds of your upper arm, so they — not your biceps — are what make a sleeve fill out. Build them by training the long head with overhead extensions, adding a pressing or pushdown movement for the other two heads, and then doing the boring part: adding weight or reps over time across roughly 10-16 hard sets a week, twice a week. Your pressing already trains them, so the trick is making sure the dedicated work covers the angle pressing misses.

Why triceps drive arm size more than biceps

The triceps are the bigger muscle, full stop. The name means "three heads" — the long, lateral, and medial heads — and together they wrap most of the back and sides of your upper arm. The biceps, sitting on the front, contribute the smaller share. That's not a knock on direct biceps work, which matters too. It's just the math of where the mass is. I'm a 37-year-old engineer, and the thing I appreciate about this is how cleanly it sorts priorities: if your goal is a thicker-looking arm and your time is limited, the triceps give you the better return per set. For the front-of-arm half, see how to build bigger biceps — the two together are what fills a sleeve.

Train the long head, not just the part you can see

The long head is the key to triceps size, and most people undertrain it. The lateral head is the one that pops into a horseshoe shape when you straighten your arm, so it gets all the attention from pushdowns. But the long head is the largest of the three, and it's the only head that crosses the shoulder joint. That means it gets the deepest stretch and the most tension when your arm is raised overhead. Skip overhead work and you're leaving the biggest part of the muscle half-trained.

The fix is to include at least one movement where your upper arm is up by your ears.

Best exercises for the long head

Overhead cable extension — face away from the stack, rope or bar overhead, elbows pointed forward. Constant cable tension through the stretch.
Overhead dumbbell extension — one or two dumbbells, seated for a stable back. Heavy stretch at the bottom.
Skull crushers (EZ-bar) — lying, lowering toward the forehead or just past it. Lower bar past your head and you bias the long head harder.

Pick one of these per session and treat it as the centerpiece, not the afterthought.

Cover the other two heads with pressing and pushdowns

The lateral and medial heads get worked hard by pressing and by pushdown-style movements, so you don't need much beyond what you may already be doing. Every bench press, overhead press, and dip drives the triceps to lock out the elbow. If you're training chest seriously — and you should be, since a bigger chest and bigger triceps grow off a lot of the same pressing — your triceps are getting meaningful volume before you ever touch an isolation movement.

That's why I count pressing toward the weekly triceps total. Then I add one isolation movement to finish the job and bias the heads pressing underloads.

Best exercises for the lateral and medial heads

Cable pushdown (rope or bar) — elbows pinned to your sides, full extension and a hard squeeze at the bottom.
Close-grip bench press — hands about shoulder-width, a pressing movement that's triceps-dominant.
Dips — bodyweight or weighted, torso fairly upright to keep the load on the triceps rather than the chest.

How much volume, how heavy, how often

Aim for roughly 10-16 hard sets per week, split across two sessions, with most sets in the 8-15 rep range. That set count includes the triceps work you get from heavy pressing, so don't double-count and then add another twelve isolation sets on top — that's how elbows get cranky. Two sessions a week beats one because it lets you spread the volume out and hit each session fresh, which means better-quality sets.

Heavy still matters. The triceps respond to progressive overload like any other muscle, so the long-head and pressing movements should be loaded hard — think 6-10 reps where your form holds — while pushdowns and overhead cable work can run a little lighter, 10-15 reps, where you can actually feel the muscle and the stretch. The non-negotiable across all of it is that the numbers go up over time. If you're lifting the same weight for the same reps three months from now, the muscle has no reason to grow. Add a rep, then another, then a little weight, and repeat.

A simple weekly layout that works:

Day 1: heavy overhead extension (3-4 sets, 6-10 reps) + cable pushdown (3 sets, 10-15)
Day 2: close-grip press or dips (3 sets, 8-12) + a different overhead variation (3 sets, 10-15)

That's six to seven dedicated sets per session, your pressing covers the rest, and you land inside the 10-16 window without overthinking it.

What actually limits triceps growth

The two real bottlenecks are skipping the long head and never adding weight — not your exercise selection being slightly wrong. People bounce between routines looking for a magic movement when the boring fundamentals are what's missing: overhead work in, progressive overload applied, enough recovery to grow. Form helps too. Keep your elbows from flaring all over the place so the tension stays on the triceps, control the lowering portion instead of dropping the weight, and get a full stretch at the bottom of every rep — the stretch under load is where a lot of the growth signal lives.

If you'd rather follow a structured plan than assemble one yourself, I put together a free training guide that lays out the sets, reps, and progression so you can stop guessing — grab it here.

Do the simple things consistently. Train the long head overhead, let your pressing carry the lateral and medial heads, keep your weekly sets in the 10-16 range across two sessions, and add a rep or a little weight nearly every week. Bigger triceps come from that — not from a clever exercise you haven't tried yet.