Research · Football Conditioning

The Small-Sided Games Dial: How Pitch Size, Player Numbers, and Rules Control Football Conditioning

By Muhammad Dzulhisham · MSc Sports Coaching, NSCA-CSCS

Ask a coach what a small-sided game is for and the answer is usually technical: more touches, faster decisions, pressure that looks like the real thing. That's true, and it's also only half of what the sports-science literature has actually established. The foundational review on the subject — Hill-Haas, Dawson, Impellizzeri, and Coutts's 2011 systematic review in Sports Medicine — treats small-sided games as something else entirely: a conditioning tool with its own adjustable dials.¹ Pitch area, player numbers, rules, and even how loudly a coach shouts from the sideline all function as prescriptive variables a coach can turn up or down, in the same way a running coach adjusts interval length or recovery time. The general pattern the review settled on was simple to state and easy to underestimate in practice: exercise intensity rises as player numbers fall and as the relative pitch area available to each player grows. Two dials, moving in different directions, both pushing the same outcome.

Fewer players, harder work

The clearest illustration of the player-number dial comes from a study that put the same amateur players through match-play and a spread of small-sided formats while tracking heart rate throughout. Three-a-side games produced significantly higher heart-rate responses — averaging 90.0% of maximum heart rate — than the players' own official matches, while nine-a-side games fell significantly below match-play intensity, averaging 79.4% of maximum heart rate.² Between those two formats sits an entire training menu: 4-a-side, 5-a-side, and 7-a-side games occupy the space in between, each format nudging players toward or away from match-level physiological strain without changing the sport being played. A 2012 review in the Journal of Human Kinetics synthesising this body of work reached the same broad conclusion — fewer players sharing a pitch means each covers more relative ground, touches the ball more often, and works harder cardiovascularly, even though the total distance covered by the whole group is lower than in bigger-sided games.³ Reducing numbers is, in effect, the most direct lever a coach has for pushing a session toward high-intensity aerobic and anaerobic strain.

Pitch size: the space-per-player dial

Space works differently to numbers, and the distinction matters for anyone trying to use small-sided games deliberately rather than by feel. A 2023 meta-analysis in Biology of Sport pooling 41 studies compared smaller and larger pitches directly and found that larger pitches produced significantly greater values across the board — heart rate, rating of perceived exertion, total distance covered, and high-speed running distance all rose with more space, every comparison significant at p<0.001.⁴ But the size of the effect wasn't uniform. Total distance covered showed a large effect (d=1.95) and high-speed running a similarly large one (d=1.20), while heart rate moved by a comparatively modest amount (d=0.50). A companion systematic review in the same journal family, pooling 11 studies across a relative-area range of 25 to 275 square metres per player, found the same pattern: distance and high-speed running responded strongly to extra space, heart rate responded more mildly.⁵ The mechanism is straightforward enough — more room to cover means more running and more opportunity to hit high speed, particularly during transitions, while the cardiovascular cost of that extra running climbs more slowly.

Put the two dials next to each other and a useful distinction emerges. Cutting player numbers is the more efficient way to drive up heart rate and blood lactate — internal physiological strain. Expanding the pitch is the more efficient way to drive up total distance and high-speed running — external running output. They're not interchangeable tools for the same job; they're two different jobs that happen to look similar on a whiteboard.

Stacking the dials: what one controlled trial actually showed

The clearest demonstration of how far these variables can be pushed together comes from a controlled trial of 20 amateur players (VO2max 56.3 ml·kg⁻¹·min⁻¹) that manipulated game format, pitch size, and coach encouragement simultaneously.⁶ At one extreme, a three-a-side game on a larger pitch with active coach encouragement produced 91±2% of maximum heart rate, blood lactate of 6.5±1.5 mmol/L, and a perceived-exertion rating of 7.2. At the other extreme, a six-a-side game on a small pitch with no coach encouragement produced 84±5% of maximum heart rate, blood lactate of only 3.4±1.0 mmol/L, and a rating of 4.8. Same players, same session length, same sport. The gap between the two conditions — roughly the difference between a hard aerobic-power session and a moderate technical run-through — came entirely from how the coach set the parameters before the whistle blew.

Small-sided games aren't one training stimulus with a fixed intensity. They're a dial with a documented range — and player numbers, pitch size, rules, and a coach's own voice are the hands that turn it.

The encouragement variable is worth isolating on its own, because it's the cheapest lever available and the evidence behind it is unusually clean. A 2020 study in the International Journal of Environmental Research and Public Health compared the same small-sided game played with and without verbal encouragement from the coach and found heart rate rose from 84.31% to 88.06% of maximum, blood lactate rose from 3.62 to 4.43 mmol/L, and perceived exertion rose from 6.62 to 7.62 — all large effect sizes.⁷ What makes the finding more useful than a simple "shout louder" takeaway is what happened to enjoyment at the same time: it went up, not down, alongside a large increase in self-reported vigour. Encouragement is one of the few intensity levers in this literature that doesn't trade physical load against how much the players actually want to be there.

Rules: the dial that moves two things at once

Touch restrictions, goal type, and goalkeeper presence form a third category of manipulation, and they reveal something the pitch-size and player-number research doesn't show as clearly: external load (distance, sprinting) and internal load (heart rate, lactate) don't always move together. Sometimes a rule change pushes both up. Sometimes it pushes one up while leaving the other flat.

Touch limits

A 2025 study in Frontiers in Sports and Active Living examined one- and two-touch restrictions against free play and found the restricted conditions increased time spent in the highest heart-rate zones, increased sprint distance and high-intensity running, and pushed passing volume up sharply — more total passes, both successful and unsuccessful, with one-touch producing the largest jump. The effects held regardless of player skill level or how many players were on the pitch.⁸ A touch restriction is a rare case where the physical and technical demand rise together rather than trading off against each other, which is presumably why it shows up so often in professional first-team sessions.

Mini-goals and goalkeepers

Removing goalkeepers and shrinking the target to mini-goals tells a different story. A 2022 study in Biology of Sport found that mini-goal formats produced meaningfully lower external load than an equivalent possession-based game — around 482 metres covered in the first bout versus 532 metres, with fewer high-acceleration efforts — but internal load, measured by heart rate, was essentially unchanged between the two formats.⁹ The same decoupling shows up from the other direction with goalkeeper presence itself: a 2016 study in the Journal of Human Kinetics found that adding a goalkeeper to a small pitch (28×20m) actually lowered heart-rate intensity, from 87.38% to 84.75% of peak heart rate, likely because shots and goals interrupt play and create recovery moments — but on a larger pitch (42×30m) the goalkeeper's presence barely moved heart rate at all, and on that same small pitch, total distance covered was paradoxically slightly higher with a goalkeeper present than without one.¹⁰ Neither of these findings would show up if a coach only tracked one load metric. A GPS unit reporting distance would miss what the heart-rate strap picked up, and vice versa.

The practical read is that rules are the most precise dial available, but also the one that most requires knowing which specific outcome — running volume or cardiovascular strain — is actually being targeted before reaching for a change.

Does this actually replace conditioning, or just resemble it?

Everything above describes small-sided games as a tunable stimulus. It doesn't yet answer whether tuning that stimulus produces the same training adaptation as conditioning built the traditional way — cones, stopwatch, no ball. The most direct test of that question is a randomised trial that split 40 junior soccer players into two groups: one trained with generic running-based interval work, the other with small-sided games matched to the same heart-rate target (4 bouts at 90-95% of maximum heart rate, with active recovery between bouts).¹¹ The result was that small-sided-game training and running-based interval training produced statistically comparable improvements in aerobic fitness and Yo-Yo Intermittent Recovery Test performance — the running-based method held no measurable physiological advantage over the ball-based one, despite one group spending its training time touching a football under game-realistic pressure and the other spending it running in straight lines.

That result is the reason "dual tool" isn't a marketing description of small-sided games — it's what a controlled comparison actually found. The conditioning stimulus doesn't have to be borrowed from athletics and bolted onto a football session as a separate block. Built correctly, using the variables above, it's already inside the game being coached.

Setting the dials in practice

• Fewer players on the same pitch is the most reliable lever for raising heart rate, blood lactate, and perceived exertion — the tool of choice for a high-intensity aerobic or anaerobic emphasis.
• More relative pitch area per player raises total distance and high-speed running specifically, often without moving heart rate nearly as much — a lever for match-speed running exposure rather than raw cardiovascular strain.
• Touch restrictions push physical and technical demand up together, making them useful when a session needs both without adding extra time on the clock.
• Removing goalkeepers for mini-goals can trim external running load in a congested fixture week without necessarily lowering the cardiovascular training effect.
• Verbal encouragement is a free intensity lever with genuine evidence behind it, and unlike most of the others, it raises enjoyment rather than costing it.

None of this makes cone-and-stopwatch conditioning obsolete, and the research doesn't claim it should. What it does establish is that a small-sided game isn't a single, fixed thing a coach either runs or doesn't. It's a set of independently adjustable parameters with a documented range of physiological outcomes attached to each — which means the honest question for any session isn't "should we play a small-sided game today," but which combination of numbers, space, and rules actually matches what that day's training is supposed to produce.