Adapting drills on the fly — when and how?

27/02/2026

A session plan is a hypothesis. It's based on assumptions about what players need and how they'll respond. Reality only reveals itself on the pitch — and that's when coaches need to know how to adapt.

Partington and Cushion (2013) found that experienced coaches make significantly more spontaneous changes to drills than novices. These changes aren't random; they come from systematic observation [1].

When should you adapt a drill?

Three situations that call for adaptation:

Players succeed more than 80% of the time. Challenge is missing and learning stalls [2].
Success rate below 20%. Frustration builds and motivation drops [2].
Players standing around, queuing, or waiting for their turn. Over 30% passive time is common [3].

Challenge level matters

Guadagnoli and Lee (2004) proposed the Challenge Point Framework: learning is most effective when task difficulty matches the player's skill level [2]. Too easy provides no challenge; too hard prevents success.

In practice, this means a success rate of roughly 40–70%. If nearly every pass reaches its target in a passing drill, it's too easy. If nobody succeeds, it's too hard.

Changing constraints

The Constraints-Led Approach (CLA) gives coaches concrete tools for adjusting drills [4]. The Finnish Football Association's coaching guidelines (2023) also emphasise game-centred training where changing conditions guides player behaviour [11]. Instead of telling players what to do, change the conditions so that the desired behaviour emerges naturally.

Increasing difficulty

Reduce pitch size → less time and space for decisions
Add defenders → more pressure
Limit touches → forces faster thinking
Remove goals and add end zones → requires combination play

Decreasing difficulty

Enlarge pitch → more space and time
Add a floater/joker → easier ball retention
Allow unlimited touches → less pressure
Add small goals → more scoring opportunities

Quick adjustments by the numbers

Change	Effect	Source
20% pitch size reduction	Heart rate up 3–5%, more touches	[5]
3v3 → 4v4	Ball contacts drop ~25%, tactical complexity increases	[6]
Adding a floater	Creates numerical superiority; running speeds and team positioning change	[7]
Touch limit (2-touch)	Passing speed increases, decision time decreases	[8]
Coach encouragement	Heart rate rises from 84% to 91% HRmax	[5]

An observation model for training

Harvey et al. (2013) followed three college coaches for a season. Their coaching behaviour changed little from one type of practice activity to another, and it was guided more by their own beliefs about teaching than by research [9]. Adapting a drill takes the opposite habit: you don't just launch it and watch from the side, you keep reading the situation.

A practical tool: the 90-second cycle.

Observe for 60 seconds. What are players doing? Is the challenge right? Are there inactive players?
Decide in 10 seconds. Is a change needed? What single thing would improve the drill?
Act in 20 seconds. Change one thing: pitch size, player numbers, a rule, or the goal type.

One change at a time. If you change everything at once, you won't know what worked.

Common mistake: too many changes at once

Abraham and Collins (2011) warn that inexperienced coaches often make too many changes simultaneously [10]. The result: the original drill falls apart and the new version doesn't work either.

One rule: change one thing at a time. Allow 2–3 minutes to see the effect before making another adjustment.

Example: a 4v4 game that isn't working

Situation: players cluster around the ball, no real game develops.

Observation: The pitch is too small for the number of players. No space or time.
Option A: Enlarge pitch by 5 metres per side → space to play.
Option B: Switch to 3v3 + floater → overload player opens up the game.
Option C: Add end zones instead of goals → forces use of wide areas.

Pick one. Try it. Reassess after 2 minutes.

Try it in practice

Two drills where adjusting difficulty is a natural part of the exercise: