Fullback Position: How Rugby Union’s No. 15 Defends, Attacks and Trains

The fullback is usually the deepest backfield player in 15-a-side rugby union and conventionally wears No. 15 (World Rugby). The position’s first task is to protect space behind the defensive line. From there, the fullback fields kicks, organises the back three, tackles line-breakers and turns loose ball into counter-attack.

That does not mean standing near the posts and waiting. A good fullback moves early, communicates constantly and joins the attack at the right moment. World Rugby’s coaching framework includes aerial catching, backfield coverage, tackling, kicking, passing and linking with the midfield and wings among the role’s requirements (World Rugby Passport).

This guide is for adult club rugby. Age-grade players must follow their union’s current playing and contact-training rules.

What does a fullback do?

Cover the backfield

The fullback scans the ball, the attacking shape and the opposition’s likely kicking options. Their starting position changes with:

• where the ball is on the field;
• which foot the likely kicker uses;
• whether one or both wings have joined the front line;
• the wind and surface;
• the score and team plan.

There is no useful universal instruction such as “stand ten metres behind the line.” The correct depth is one from which the player can move forward to catch, turn to cover a kick behind and support either edge.

Use three questions before every phase:

1. Where is the ball?
2. Where is the most dangerous space?
3. Which teammate is helping me cover it?

The fullback should call the picture early: “left covered,” “hold,” “drop,” or the team’s agreed language. Without a clear call, two players may chase the same kick while another channel stays open.

Field kicks and choose the next action

Catching is only half the job. Before receiving, the fullback should identify pressure, support and space. The next action will usually be one of four choices:

• Run into disorganised space with connected support.
• Pass to a better-placed wing or support runner.
• Kick when the team can gain territory or attack uncovered space with an organised chase.
• Secure possession when isolated or under immediate pressure.

For a high ball, move the feet early, keep watching its flight and call decisively. Start training this skill unopposed and add pressure only after the catch is repeatable. A chaser must not tackle, charge, pull, push or grasp a receiver whose feet are off the ground (World Rugby Law 9.17). Do not use aerial collisions as a shortcut to realism.

If the catch becomes a carry into contact, the fullback still needs sound tackle and contact fundamentals. Do not turn every return into a solo run: beating the first defender is of little value if the carrier becomes isolated and possession is lost.

Defend the last line

When an attacker breaks through, the fullback should reduce the carrier’s options rather than rush forward blindly. Stay balanced, protect the inside first and close the space under control, using the touchline or recovering defenders where the team’s system allows.

The fullback must be able to make front-on, side-on and cover tackles; World Rugby’s positional framework includes front-on, side-on and rear tackles. Contact work should follow a coach-led progression. Use the legal tackle height for the competition, preserve safe head placement and complete the arm wrap rather than practising shoulder-only collisions.

Join the attack

The fullback is also an extra attacker. Common entries include:

• outside the fly-half or centre as a wide runner;
• behind a lead runner as a second receiver;
• on an inside support line after a break;
• on the far side after several phases.

The cue is not simply “get into the line.” Enter with enough depth to see the pass and enough pace to threaten space. Communicate before arriving so the passer knows whether the fullback is a receiver, decoy or distributor.

Rugby Toolbox’s position analysis also emphasises reading play, seeking attacking involvement and fitting into a back-three pattern rather than treating fullback as an isolated role (Rugby Toolbox).

Core fullback skills

A club fullback should develop these in roughly this order:

1. Scanning and communication: see the ball, opposition shape, wings and uncovered grass.
2. Ground-ball and high-ball handling: gather cleanly while moving and under controlled pressure.
3. Back-three positioning: move with both wings rather than reacting alone after the kick.
4. Passing at pace: transfer the ball accurately in either direction.
5. Tackling: manage one-on-one and cover situations with legal, controlled technique.
6. Kicking: clear under pressure, find territory and execute the team’s chase plan.
7. Counter-attack decisions: run, pass, kick or secure according to the picture.

A fullback does not have to be the team’s longest kicker or fastest runner. Reliability, early movement and clear decisions are more useful than one outstanding skill surrounded by positional errors.

A 30-minute fullback progression

Players: One back three, two or three kickers and optional chasers Area: About half a pitch, adjusted for kick range, ability and conditions Equipment: Balls, cones and bibs

1. Move, call and catch — 8 minutes

Setup: Put the back three across one half of the field. One kicker stands near halfway. Mark three backfield channels with cones.

Action: The kicker moves the ball laterally before kicking into any channel. The back three adjust together. The receiver calls early and gathers; the other two players become passing options. Begin with low, controlled kicks before adding height.

Checkpoint: Can the fullback call which spaces the wings own before the kick? Are all three players moving as the ball moves, rather than waiting for the kick?

2. Catch and decide — 10 minutes

Setup: Keep the same area. Add one controlled chaser who begins far enough away to avoid an aerial contest. Use the chaser’s starting line and angle to create different pictures.

Action: The kicker sends a catchable ball into the backfield. The receiver scans, catches and responds to what is visible:

• a disconnected chaser and nearby support: run or pass;
• an organised chase with space behind it: kick if that suits the team plan;
• immediate pressure and no clear exit: protect the ball and connect with support.

The chaser approaches only after the receiver has landed and does not make contact. Rotate players so the wings also practise the fullback’s decisions.

Checkpoint: Does the receiver scan before the catch? Is the decision based on pressure, support and space rather than selected in advance?

3. Pendulum game — 12 minutes

Setup: Divide the width into three channels and the playing area into two halves. Use two teams of three. The team in possession moves and passes behind halfway before choosing whether to kick. The defending back three must keep a player in the channel opposite the ball while balancing the space behind.

Action: Award the attack a point for landing a kick in genuinely uncovered space. Award the defenders a point for a clean gather followed by a controlled pass, run or kick to a nominated target. As the ball moves across the field, the defenders shift together: the near wing can move forward while the fullback and far wing balance behind.

This is a simplified version of a published pendulum game in which the wings move up and across while the fullback covers behind them (Rugby Coach Weekly).

Checkpoint: Freeze play occasionally. Ask each defender to name the space they own and the threat they can see. If two players give the same answer, check which channel has been left uncovered.

Keep the progression non-contact unless a qualified coach has separately prepared the players for contact. Increase decision pressure through more accurate kicking, changing chase pictures and reduced time before adding collisions.

Match review checklist

After a match, review a few observable actions:

• Did the fullback communicate before opposition kicks?
• Did the back three move together as the ball changed sides?
• Which kicks bounced before being gathered, and why?
• Were counter-attacks connected to support?
• Did attacking entries add width, pace or a passing option?
• In last-line defence, did the fullback stay balanced and close under control?

Review the positioning before judging only the outcome. A dropped catch is obvious; the late movement that made it unnecessarily difficult may be the more useful coaching point.