Alors regardez bien les exercices, positions du corps, pour un bon entrainement.
https://www.youtube.com/watch?v=OPTH305ME70&feature=topvideos
https://www.youtube.com/watch?v=OUmS_co46IY&feature=channel
https://www.youtube.com/watch?v=4Kg8g-HwRmQ&feature=channel
https://www.youtube.com/watch?v=oA-lCkR0nhg&feature=related
https://www.youtube.com/watch?v=KN2tr_yZf9U&feature=related