“Playing up” is one of the most common—and often unquestioned—development decisions in youth sport.

In this episode, I break down a recent study examining how academy football coaches actually make those decisions. Rather than measuring outcomes, this research focuses on coach perception—what they look for, how they justify it, and where things can go wrong.

We explore how factors like biological maturation, social environment, and communication shape the playing-up process, and why it may not be the development advantage it’s often assumed to be.

• Playing-Up
  A younger athlete competing in an older age group to increase challenge.

• Relative Age Effect (RAE)
  Bias toward athletes born earlier in the selection year.

• Relative Growth Effect (RGE)
  Advantage based on biological maturation rather than chronological age.

• Challenge Point Theory
  Optimal learning occurs when task difficulty slightly exceeds current ability.

• Playing up is not inherently beneficial—it is highly context-dependent.

• Coaches often rely on subjective evaluation, which can be influenced by early maturation.

• Social environment—especially parents and peer group—plays a major role in outcomes.

• If an athlete is not meaningfully involved (touches, decisions, reps), development may decrease.

• Playing up may redistribute opportunity, rather than create new development.

• Evaluate athletes across:

  • Technical

  • Tactical

  • Physical

  • Psychosocial domains

• Ensure:

  • The athlete can stay involved in play

  • The physical mismatch is manageable

  • Communication with player and parents is clear

• Consider blended approaches:

  • Majority reps at appropriate level

  • Strategic exposure to higher levels

• Small sample size (10 coaches)

• UK academy system only

• Based on coach perception, not performance outcomes

• Findings are not universally generalizable

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