Woman is lifting weights with her legs using a leg press machine . When she lifts the weight she keeps her leg extended rather than bending it . This allows more of the muscle to be used, which means that you can lift heavier weights without having your muscles contract as much.
Woman is lifting weights with her legs using a leg press machine . When she lifts the weight she keeps her leg extended rather than bending it . Weight bears down , pushing her leg the wrong way and injuring her leg . She writhes in agony as a man standing nearby rushes to help her . Expert today told MailOnline people should never use machines like leg presses without appropriate training or supervision .