Rugby is the rare team sport where the numbers on the shirts are not decoration. In rugby union, the number tells you the job. A number 2 does something completely different from a number 12, and a coach can put a squad on a whiteboard using nothing but digits. Here is what all fifteen of them actually do, why they are built the way they are, and a short set of questions that will point you at the one you should be asking to trial for.
The two halves of a rugby team
Every rugby union side splits into two units with different responsibilities, different physiques and, usually, different personalities.
The forwards — shirts 1 to 8, collectively the pack — win the ball. They pack down in the scrum, lift and jump in the lineout, and do most of the close-quarters work of clearing rucks and carrying into contact. It is heavy, repetitive, mostly unglamorous work in confined space.
The backs — shirts 9 to 15 — use the ball. Once the forwards have won it, the backs are the ones with space to run into, and the job becomes about speed, decision-making, angles and kicking. They cover more ground at higher speed and get hit less often, but harder and in more open field.
That division is why rugby accommodates such a wide range of bodies. A team genuinely needs someone short and immensely strong at number 1 and someone tall and fast at number 14, and neither could do the other job.
- 1
- Loosehead
- 2
- Hooker
- 3
- Tighthead
- 4
- Lock
- 5
- Lock
- 6
- Blindside
- 8
- Number 8
- 7
- Openside
- 9
- Scrum-half
- 10
- Fly-half
- 12
- Inside centre
- 13
- Outside centre
- 11
- Left wing
- 14
- Right wing
- 15
- Fullback
The front row: 1, 2 and 3
The front row is the three players who make direct contact with the opposition front row in the scrum. It is the most specialised unit on the field and the only one the laws protect explicitly: a match will be moved to uncontested scrums if a team cannot field trained front-rowers, because the injury risk of putting an untrained player there is genuinely serious.
Loosehead prop (1)
Packs down on the left of the scrum, with their head on the outside of the opposition tighthead. The looser position gives them more room to work and a slightly easier body angle. In open play a loosehead is a carrier and a ruck-clearer, and increasingly expected to be a lineout lifter.
Hooker (2)
Binds between the two props and hooks the ball back with their foot when it is fed into the scrum. Their other, arguably harder job is throwing the ball into the lineout — a repeatable, high-pressure skill that takes years to make reliable. Hookers tend to be the shortest and among the strongest players on the field.
Tighthead prop (3)
The most technically demanding position in rugby. The tighthead packs down on the right with their head between the opposition loosehead and hooker, taking pressure from two directions at once. A good tighthead can hold a scrum up single-handed; a struggling one gets a team penalised repeatedly. Good ones are scarce enough that clubs build seasons around having one. If you want the full picture of what is happening in there, we broke it down in the scrum, decoded.
The second row: 4 and 5
The two locks are usually the tallest players on the pitch, and their primary job is winning the ball in the air at the lineout — being lifted by teammates to catch or tap the throw. In the scrum they bind behind the front row and provide the bulk of the forward drive. In open play they carry, clear rucks and tackle, relentlessly.
Second row is one of the best entry points for a tall beginner. The core skills — jump, get lifted, push, tackle, clear — are learnable in a season, and height is not something you can coach into someone else. Lineout basics covers the calls and the lifting laws if that is the part you want to understand first.
The back row: 6, 7 and 8
The back row is the pack's mobile unit, and the three roles are genuinely distinct despite often being lumped together as "loose forwards".
| Shirt | Position | Primary job | Built like |
|---|---|---|---|
| 6 | Blindside flanker | The enforcer. Tackles, hits rucks hard, carries into traffic, and defends the narrow side of the field. Often a lineout option too. | Tall and heavy for a back-rower. Power over pace. |
| 7 | Openside flanker | The scavenger. First to every breakdown, competing to steal the ball off the floor before a ruck forms. Highest tackle count in most teams. | Smaller, lower, ferociously fit. Work rate is the whole job. |
| 8 | Number 8 | The link. Packs at the back of the scrum and can pick the ball up and run from it. Carries in open play and connects the pack to the backs. | Big, mobile and good with ball in hand. Often the best athlete in the pack. |
The half-backs: 9 and 10
These two are the steering wheel. Nearly every attacking move goes through one of them, and they touch the ball more than anyone else on the field.
Scrum-half (9)
Feeds the scrum, clears the ball from the base of every ruck, and makes the first decision on almost every phase: pass, run, or kick. Usually the smallest player on the pitch and almost always the loudest, because the scrum-half is the one shouting at the forwards. The pass off the floor, both directions, at speed, is the defining skill.
Fly-half (10)
The tactical decision-maker. Receives from the scrum-half and chooses the shape of the attack, and usually takes the goal kicks. The 10 controls where a team plays on the field through their kicking game, which is why they are often the most scrutinised player in the side.
The centres: 12 and 13
The midfield pair. The inside centre (12) is generally the heavier of the two — a carrier who takes the ball flat and hard to commit defenders, and often a second distributor alongside the fly-half. The outside centre (13) is usually faster and is the defensive lynchpin of the backline, because the 13 channel is where most attacking teams aim their strike moves.
The back three: 11, 14 and 15
The two wings and the fullback cover the widest and deepest parts of the field, and in modern rugby they interchange constantly rather than staying pinned to a channel.
The wings (11 and 14) are the finishers — usually the fastest players in the team, and the ones who score most of the tries. They also field kicks and are expected to appear in midfield to carry when a team needs to get out of its own half.
The fullback (15) is the last line of defence and the primary receiver of opposition kicks. It demands the most complete skill set on the field: catching a high ball under pressure with three players arriving, kicking out of hand off both feet, tackling in isolation, and joining the attack as an extra runner.
Rugby is the only sport I know where a coach can look at a squad of very different bodies and find a genuine job for every single one of them.
- Front row (1, 2, 3)
- 10/10 (Scrum, maul, ruck. Almost all of it.)
- Second row (4, 5)
- 9/10 (Plus the aerial work)
- Back row (6, 7, 8)
- 9/10 (Highest tackle counts in the team)
- Half-backs (9, 10)
- 5/10 (Constant involvement, less collision)
- Centres (12, 13)
- 7/10 (Heavy collisions, more space)
- Back three (11, 14, 15)
- 4/10 (Fewer contacts, more running)
Which position should you play?
If you are new, ignore the position you like watching and start from what your body and temperament already give you. Almost nobody ends up where they first thought they would.
- Are you noticeably taller than most people you know? (Yes: try second row / No: keep going)
- Are you strong, low to the ground and happy in a confined space? (Yes: front row / No: keep going)
- Are you the fittest person in most rooms, and do you enjoy chasing things? (Yes: back row, probably 7 / No: keep going)
- Are you genuinely fast over 40 metres? (Yes: wing or fullback / No: centre or 12)
- Still unsure? Ask to start at second row or centre. Both are forgiving of a first-season learning curve and neither requires a specialist skill on day one.
One honest caveat: your first club will often put you where they are short, not where you fit. That is not a slight, and it is frequently how people find the position they were actually built for. Say yes for a season. If you have not joined a club yet, our guide to joining a rugby club in Canada covers what happens first, and position-specific gym work covers how training changes once you settle somewhere.
Common questions
What do the numbers 1 to 15 mean in rugby?
They are the positions, not squad numbers. 1 to 8 are forwards, 9 to 15 are backs, and the convention is the same worldwide. The starting fifteen wear 1 to 15 and replacements wear 16 upward.
Which rugby position is best for a beginner?
Second row, back row or centre. All three are built on general skills — tackling, carrying, clearing rucks, catching and passing — rather than a specialist technique. Front row is the one position beginners should not be put into without specific coaching, because the scrum carries real injury risk when it is done wrong.
What is the difference between a 6 and a 7?
Both are flankers. The blindside (6) is typically bigger and does the heavy tackling and carrying; the openside (7) is smaller, faster and specialises in competing for the ball on the ground at the breakdown. Some teams pick two of the same type, but the classic split is power and scavenging.
Do you need to be big to play rugby?
No. You need to be somewhere on a very wide spectrum. Scrum-halves and opensides are often among the smallest players on the field, and wings are built for speed rather than mass. What every position does require is the willingness to tackle.
Can you change position?
Constantly, and most players do. Bodies change between 16 and 25, and a lot of senior players are in their third or fourth position. Props in particular are frequently converted from somewhere else in their twenties.
