School notions of the back
When lifting a heavy weight, it is advisable to squat as far as possible and to inhale deeply, to contract the abdominal and gluteal muscles. This breathing and contraction increases the pressure around the spine and thus ensures a pneumatic jack that supports all sensitive structures. It is advisable to keep this contraction and attitude and to lift while straightening with the force of the extensor muscles of the lower limbs. Once the load is raised, it should be kept close to the body and deposited expiring at the end.