case_images: PMC6850519_01
case_images: Image of the pitch from Adam's GoPro camera.. aThis image has been edited to be black and white to avoid identification of the participating teams through their kit colours.
case_images: pone.0225033.g001.jpg
case_images: PMC6850519_01_pone.0225033.g001.jpg
case_images: pone.0225033.g001
case_images: Each participant took up a position at pitch level on opposite sides of the pitch on the half way line (Fig 1) and engaged in a full 90-minute football game, with the typical 15-minute half-time interval.