Table 1.

Programme descriptions

	Extended Knee Control	Adductor programme
Exercises	Running warm-up (5 min) 6 main strengthening and neuromuscular control exercises (10 variations for each) (10–15 min): One-legged knee squat Hamstring strengthening Two-legged knee squat Core strengthening Lunge Jump/landing technique Of these, 44 are individual exercises, including 6 with a resistance band and 16 partner exercises	One exercise out of: Copenhagen adduction, long lever Copenhagen adduction, short lever Side-lying adduction Adductor squeeze (ball between knees, bent legs) Adductor squeeze (ball between feet, straight legs)
Frequency	Every training session throughout the season. Running warm-up before matches.	2–3 times/week pre-season 1 time/week competitive season
Dosage	30–60 s per exercise 2 sets	3–5 to 12–15 repetitions (Copenhagen adduction and Side-lying adduction) or 10 s maximal isometric contractions × 5 repetitions (Adductor squeeze) 1 set
Recommendations about progression	Start at a level that offered sufficient challenge to the players and to progress to more demanding exercises over time. Important that the exercises were done with proper technique before progressing.	Start with Copenhagen adduction long lever. Players unable to perform the exercise with correct technique, prescribed dosage, or who experienced pain >3 on a 0–10 numerical rating scale were recommended to use an easier exercise variant. Adductor squeeze recommended as alternative exercises to avoid close player-to-player contact. Progression mainly through more repetitions during preseason
Equipment	Football, resistance band for some exercises	Football (adductor squeeze)
Setup	Before training, as a warm-up, imbedded in the training, after training or a combination of these	Before or after training

The adductor programme comprised exercises from Harøy et al,¹⁵ the Copenhagen adduction and side-lying adduction, and Hölmich et al,¹⁸ the two adductor squeeze exercises.