Endurance in the Development of the U17 Player
In U17, endurance is a performance skill. It is no longer a quality to build progressively: it is a resource the player must call upon across the full 90 minutes, including late in the game when physical and mental fatigue sets in. A U17 player whose endurance collapses at the sixty-minute mark simultaneously loses agility, decision quality, and defensive commitment, precisely in the moments where a match can turn.
What changes at this age is that endurance must now be trained under conditions that replicate the end of a match: accumulated fatigue, sustained intensity, and technical actions to maintain despite the effort. The U17 circuit drills offer chained high-intensity formats particularly well suited to this objective, with a progressive increase in difficulty that replicates the physical conditions of a second half.
How to Improve Your U17 Players' Endurance
In U17, improving a group's endurance comes first through building a culture of intensity across all training situations. A group that never trains at maximal intensity will not develop the endurance needed to sustain that level for 90 minutes. It is not a volume question: it is a question of repeated effort quality.
The most effective formats in U17:
- High-intensity small-sided games late in the session: offer the most physically demanding situations when players are already fatigued
- Short-short intervals: 15/15 or 30/30 at maximal intensity on every repetition, with or without the ball
- Repeated high press with transition: chain collective pressing and attacking transition over long sequences
- Training matches with a return constraint: all players must recover to their defensive line after every turnover
The U17 small-sided games offer many formats that integrate this physical load within competitive game contexts, never dissociating aerobic effort from game play.
Endurance and Periodization in U17
In U17, endurance can no longer be thought about session by session. It fits into multi-week planning that accounts for matches, recovery, and load cycles. Intensive endurance work two days before a match compromises players' physical freshness. Light maintenance mid-week, integrated into game situations, keeps aerobic qualities sharp without residual fatigue. Rangnick, Klopp, and Nagelsmann built their playing philosophies precisely around rigorous management of these intensity and recovery cycles. The article what is tactical periodization and how to implement it? illustrates very concretely how elite coaches integrate endurance work into an overall collective vision, directly applicable for structuring your approach in U17.