The FIFA 11+, as trialledStrong evidence
In the first trial, 1,892 Norwegian girls aged 13 to 17 in 125 clubs did the 11+ in place of their usual warm-up at every training session through an 8-month season, and its running parts before matches. Coaches had a 3-hour course, and the warm-up took about 20 minutes. Injuries fell by 32%, severe injuries by 45% and overuse injuries by 53%; leg injuries, the main outcome, fell by 29%, which wasn't statistically significant. Teams used it in 77% of their sessions.
Across 4 cluster trials, the 11+ cut injuries by 39% (95% confidence interval 23% to 52% fewer). FIFA's earlier warm-up, the 11, didn't reduce injuries.
FIFA's manual is for players aged 14 and over: before every training session, at least twice a week, with parts 1 and 3 before matches. Our warm-up and workout follow the manual. Its doses differ from the first trial's for two exercises: the plank with alternate legs (3 sets of 40 to 60 seconds in the manual, 20 to 30 in the trial) and walking lunges (2 sets of 10 on each side in the manual, 2 sets of 30 seconds in the trial).
Sources 20, 5, 4
Boys and young men tooStrong evidence
In 414 Nigerian boys aged 14 to 19 in 20 teams, the 11+ as the training warm-up for a 6-month season cut injuries by 41%, with teams using it in 60% of sessions and players in 74%. In US college men (65 teams randomised, 61 analysed, one season), the 11+ before training and matches cut injuries by 46%: 8.1 against 15.0 for every 1,000 times a player trained or played a match. The 11+ teams had 3 ACL injuries against 16 in the other teams, though 4 of them dropped out, citing a lack of time.
Sources 25, 26, 27
Compliance makes the differenceStrong evidence
In the Norwegian trial, players who did the 11+ most often had 35% fewer injuries than those who did it a moderate amount. Teams used it about 1.3 times a week, and players did it in 79% of the sessions they attended, about 0.8 times a week. In Canadian girls aged 13 to 18, the players who kept to it most had about 70% fewer injuries, and in US college men, the more sessions a team did, the fewer injuries it had.
In 265 veteran men with an average age of about 44, the 11+ about once a week for 9 months didn't reduce injuries overall, though there were fewer severe injuries; the authors put it down to too few sessions. FIFA's manual puts it plainly: "research has shown that compliance is the key factor for efficacy".
Sources 6, 28, 29, 7, 4
The 11+ Kids for players under 14Strong evidence
FIFA's manual says that for younger players some 11+ exercises shouldn't be done and others need easing off. Its children's version, the 11+ Kids, replaced the usual warm-up in a trial of 3,895 players in under-9 to under-13 teams in 4 countries for a season: injuries fell by 48% and severe injuries by 74%. Injuries fell further the more often teams did it; the authors advise at least once a week, and twice for more benefit. Our exercise for children guide has more.
Sources 4, 30
The Nordic hamstring exercise, as trialledStrong evidence
In Denmark, 942 professional and amateur men in 50 teams added a 10-week Nordic programme, then one session a week through the season. The same research group describes the 10 weeks as 27 sessions before the usual warm-up: one session of 2 sets of 5 in week 1, building to 3 sessions a week of 3 sets of 12, 10 and 8 in weeks 5 to 10. That leaves 8 sessions for weeks 2 to 4 (our arithmetic); the earlier trial the programme came from built from 2 sets of 6 to 3 sets of 8 to 12 over 4 weeks.
Acute hamstring injuries fell by about 70%, to 3.8 against 13.1 per 100 player seasons. New injuries fell by about 60% and repeat injuries by about 85%.
In 579 Dutch amateur men in 40 teams, 25 sessions over 13 weeks cut hamstring injuries from 0.8 to 0.25 per 1,000 hours, though not their severity, with 91% compliance. Across 15 studies of 8,459 athletes of both sexes in several sports, programmes that included the Nordic cut hamstring injuries by 51%; in the two football trials of the Nordic programme on its own, in 1,521 men, by 65%.
Sources 21, 31, 32, 33, 8, 34
Few teams keep the Nordic goingEmerging evidence
Two years after the Dutch trial, 69% of the players said they never did the programme and 4% always did. Across studies, 17% of elite men's teams and 3% of amateur teams kept to it, and most elite clubs don't follow the 10-week protocol. The benefit depends on doing it.
Sources 35, 36, 34
The Adductor Strengthening Programme, as trialledEmerging evidence
In Norway, 35 semi-professional men's teams (652 players) were randomised. The intervention teams did one exercise with three levels of difficulty, three times a week for 6 to 8 weeks of pre-season, then once a week through a 28-week season. Level 1 was lying on your side and lifting the lower leg (side-lying hip adduction), and the higher levels built up to the Copenhagen adduction exercise. A later paper describes an 8-week build in which the reps rose each week from 3 to 15, about 470 in all; one set on each side is our reading of it, and we couldn't see the trial's own wording for levels 2 and 3.
In an average week, 13.5% of players reported groin problems against 21.3% in the control teams: 41% lower odds. The outcome was self-reported groin problems of any kind, so the effect on strains that stop players training is less certain. Players completed about 70% of the sessions, most of which took under 5 minutes.
Afterwards, only 31% planned to keep to the protocol. Only 10% of Norwegian professional teams used it as written; most did 2 sets of 7 to 10 twice a week in pre-season and 2 sets of 8 to 11 once a week in season, and across 50 European teams about two-thirds of those using the exercise had changed it.
Sources 9, 36, 37, 38, 34
The Copenhagen builds adductor strengthEmerging evidence
In 24 under-19 sub-elite players, 8 weeks of the Copenhagen adduction exercise raised the strength of the adductors while lowering by 36%, with little soreness. In under-19 elite players, swapping it into the 11+ in place of the Nordic raised that strength by 9% more than the standard 11+, which didn't raise it at all. A gentler six-level version that starts with holds raised it by about 25% in 25 professional players, with no control group.
Sources 22, 39, 40
Protecting girls' and women's kneesStrong evidence
Across 8 meta-analyses, warm-up programmes halved ACL injuries and cut non-contact ACL injuries in female athletes by two-thirds. In 18 studies of 27,231 young female athletes, the risk fell from about 1 in 54 to 1 in 111. Those programmes averaged 24 minutes, 2 to 3 times a week; younger athletes gained most, and programmes with more strength and landing work, such as Nordic hamstring lowers and lunges, did better.
In football, 4,564 Swedish girls aged 12 to 17 in 230 clubs did the 15-minute Knee Control warm-up twice a week through a 7-month season: 7 ACL injuries against 14 in the control clubs, 64% fewer. The third of players who kept to it most had 88% fewer ACL injuries than the third who kept to it least, and compliance fell a little each month.
Exercise and Sport Science Australia's 2026 position statement recommends plyometric (jumping), strength, balance, mobility and agility exercises for 10 to 30 minutes, 2 to 3 times a week, and says the evidence in men, elite athletes and many sports is limited. One trial in US college men found 3 ACL injuries with the 11+ against 16 without.
Sources 11, 41, 42, 43, 44, 27
What hasn't workedEmerging evidence
FIFA's earlier warm-up, the 11, didn't cut injuries in 2 trials, and a similar programme didn't change injury rates in 456 high-level Dutch amateur men despite good compliance (9.6 against 9.7 per 1,000 hours). The 11+ once a week didn't help veterans. FIFA leaves static stretching out of its warm-up: stretches are "not recommended as part of a warm-up programme, but can be performed at the end of the training session".
Sources 5, 45, 7, 4