Former Borussia Dortmund player Mustafa Amini has revealed the tough training methods of his former coach David Wagner, including 4am starts and running up and down hills for 90 minutes.
Australia international Amini was on the books of Dortmund from 2011 to 2015, although he never made a first team appearance, instead playing for the second team under the management of Wagner, now head coach at Schalke.
Amini, who now plays for Danish club Aarhus GF, said he initially struggled to adapt to Wagner's high-intensity training methods, but they ultimately made him a better footballer.