Speed in football is not purely a genetic gift — a large portion of it is a trainable skill. But when should a young player begin speed training? At what intensity? And what are the real differences between age 9 and age 14?
This article is a technical guide built on peer-reviewed research from the NSCA (National Strength and Conditioning Association), the AAP (American Academy of Pediatrics), the ACSM (American College of Sports Medicine), and systematic reviews from Sports Medicine Journal and the Journal of Strength & Conditioning Research.
The core concept — chronological age ≠ biological age
The first thing every coach or parent must understand: a player’s age on paper does not reflect the stage of his physical development.
According to research published in 2025, two players of the same chronological age can be separated by up to 5 years of biological development. A 13-year-old may still be pre-pubertal, while his same-age teammate may already have passed puberty.
The scientific standard reference point is Peak Height Velocity (PHV): the moment when a child grows fastest in their life.
- In girls: it begins around age 9, with average peak at 11.5 years.
- In boys: it begins around age 11, with average peak at 13.5 years.
- Average PHV in young football players: 13.1 years.
This framework determines when we should train what.
The first window — neural speed (ages 6-10)
The most important window for developing speed is before PHV — specifically between 6-8 years in girls and 7-9 years in boys (per NSCA, 2016).
At this age, the nervous system is exceptionally sensitive to motor learning. The goal isn’t to increase muscle strength (still limited) — it’s to teach the body how to release its force quickly and efficiently.
What to focus on in this phase:
1. Agility ladders: high knees, lateral steps, two-feet-in. Goal: foot speed, rhythm, balance.
2. Reactive games: “freeze tag,” “sharks and minnows,” “red light, green light.” Goal: teach acceleration as a natural reaction.
3. Short sprints (10-15 metres) with full focus on technique: arm action, knee lift, landing on the ball of the foot.
⚠️ No weight training in this phase. Speed here comes from neural control, not from increased muscle mass.
The second window — strength as the foundation for speed (post-PHV)
In 2016, leading sport scientist G. Gregory Haff (former NSCA president) made a clear position statement: “Muscular strength is the foundation upon which power and speed are built.”
This isn’t just opinion — it’s a physiological fact. A systematic review published in Sports Medicine (2023) confirmed that:
- Muscular strength is directly correlated with linear sprint speed.
- It correlates with change-of-direction speed.
- It correlates with plyometric ability.
When does serious strength training begin?
The golden window for strength training is:
- Boys: 12-18 months after PHV (i.e. approximately 14.5-15 years at the average).
- Girls: immediately after PHV (approximately 12-12.5 years).
Research on football players found that the peak rate of muscle strength gain in boys occurs about 1.2 years after PHV — a window that should not be missed.
Strength training in children — is it safe?
The scientific answer: yes, if programmed and supervised.
Three major scientific bodies — the AAP, ACSM, and NSCA — all support children’s participation in properly designed strength training programs. The research confirms:
- No adverse effect of structured strength training on linear growth or growth plates.
- In pre-pubertal children, strength gains come from neural adaptations (more motor unit recruitment), not muscle hypertrophy — making it completely safe.
- Research published in Pediatrics (the AAP journal, 2008) concluded that appropriate programs pose no risk.
Core rules (AAP + NSCA):
1. Focus on correct technique before weight.
2. 8-15 reps per set in good form before increasing weight.
3. 2-3 sessions per week, with 48 hours’ rest between sessions.
4. Avoid competitive weightlifting, powerlifting, bodybuilding, and maximal lifts until full physical maturity.
5. Qualified-coach supervision is mandatory.
Plyometrics (explosive training) — the modern science
Plyometric training is the bridge between strength and speed. But is it safe for children?
A systematic review and meta-analysis published in Sports Medicine – Open (2023) analysed dozens of studies and concluded:
- No new muscle injuries were recorded in structured plyometric programs in pre-pubertal athletes.
- Improvements in dynamic strength, linear sprint speed, horizontal jump, and reactive strength index are scientifically established.
- The effect is independent of maturity status — both pre-PHV and post-PHV players benefit at similar levels.
Recommended protocol:
- 2 sessions per week for 8-10 weeks.
- 72 hours’ rest between plyometric sessions.
- Progressive intensity: from low (ground hops) to high (drop jumps, box jumps).
Examples of progressive exercises:
1. Beginner: two-footed forward hops, skipping, pogo jumps.
2. Intermediate: box jumps (30 cm), bounding, squat jumps.
3. Advanced (post-PHV): drop jumps from 30-45 cm, depth jumps.
Speed mechanics — acceleration vs. maximum velocity
In football, a player rarely reaches his maximum velocity during a typical match. Most sprints are between 5-20 metres. This means acceleration matters more than top speed for most players.
Research published in Scientific Reports (Nature, 2025) confirmed that:
- Acceleration depends on generating the largest net horizontal force possible during each step.
- Horizontal force differs mechanically from vertical force — and that requires dedicated training.
Recommended drills for acceleration:
1. 3-point starts: from a semi-crouch position, explode forward 10-15 metres.
2. Resisted sprints: with a light sled or elastic band — develops horizontal force.
3. Flying sprints: 15-metre acceleration zone, then 15 metres at maximum speed — develops top speed and matches game profile.
4. Reactive sprints: starts on a visual or auditory cue — develops reaction time.
Caution: the PHV phase itself — highest injury risk
Research published in 2025 revealed an important finding: mid-PHV athletes (i.e. during the growth spurt itself) have a significantly higher injury risk compared to those before or after PHV.
Why: at this stage, bones grow faster than muscles and tendons, temporarily breaking musculoskeletal balance. Common injuries during this phase:
- Growth plate inflammations (Osgood-Schlatter, Sever’s disease).
- Hamstring strains.
- Lower back pain.
Growth rates that elevate risk:
- More than 7.2 cm/year in boys.
- More than 6.7 cm/year in girls.
Scientific recommendation: measure height every 3-6 months during adolescence, and adjust training load accordingly. This is something many coaches overlook — and the cost is preventable injuries.
A practical weekly programme for a 14-16-year-old player (post-PHV)
This is a model based on the scientific principles above:
- Monday: maximum-velocity sprint work + technique + acceleration mechanics (45 minutes).
- Tuesday: general strength session in the gym (squats, deadlifts, push-ups, 8-12 reps) (60 minutes).
- Wednesday: technical/tactical training with the team.
- Thursday: plyometrics (progressive jumps) + agility (45 minutes).
- Friday: light technical session.
- Saturday: match.
- Sunday: full rest or active recovery (light swim, stretching).
Common mistakes to avoid
1. Starting heavy weights before learning technique: the #1 cause of injury in youth.
2. A constant training load year-round: the body needs recovery phases and variety.
3. Ignoring a player’s growth: training load must be reduced during PHV.
4. Early specialisation: playing only football from childhood increases injury and burnout risk. Research encourages sport variety up to roughly age 12-13.
5. Copying pro players’ programmes: a 16-year-old is not a smaller version of a 25-year-old — his needs are physiologically different.
Conclusion — speed is a long-term investment
Developing explosive speed isn’t a project of one month or one season — it’s an integrated system spanning 8-10 years of a young player’s life. The players who reach professional level with exceptional speed are usually the ones who received scientific, progressive training from a young age, with respect for their biological age.
What is scientifically certain:
✓ Speed can be developed at all ages.
✓ Each age window requires a different type of training.
✓ Strength training is safe and effective for children when properly programmed.
✓ Plyometrics is safe and effective both pre- and post-puberty.
✓ Injuries during the growth spurt can be reduced by monitoring training load.
The fastest player of the future isn’t necessarily the fastest at age 12 — it’s the one whose talent receives the right scientific training across the years.