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The lower back extension on a 45° bench works the muscles running along the spine, the glutes and the hamstrings.
Position yourself on the bench, hips just above the pad, feet anchored, arms crossed over your chest.
Lower your torso by flexing your hips, then raise it until your body forms a straight line.
Stop at alignment: do not hyperextend past the line.
Image and text: Bryl Lim / Everkinetic — recoloré et rastérisé — CC BY-SA 4.0, via Workout Guide. Original entry