What the two soccer players are reading in the video is a very famous Japanese soccer manga called ‘キャプテン翼 (Kya pu te n Tsu ba sa)’. Their task is to copy the curve shoot in the manga.
キャプテン翼 was read by many soccer players all over the world including Zidane, Thierry Henry, Messi, Andrés Iniesta, Fernando Torres, Alessandro Del Piero, Francesco Totti and so on.