is it safe to train oblique on hyperextension machine?

no! it is not! in this video I tell you why it is a mistake and what can you do instead to get results in a safe way. a lot of people get injured in their spine not because of squats or deadlifts, but because of poor posture and wrong core exercise technique. not every core exercise that seems to work on your core muscles should be performed, the priority must always be health and safety. although the spine needs to move in order to contract the main muscles in that region, to keep your spine healthy, you must avoid any excessive sagittal or frontal flexion and any exaggerated transverse movement, which this exercise does them all!