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Yes, properly performed deadlifts can strengthen your lower back by training the spinal erectors along with your hips and legs.

Yes, deadlifts work the biceps as stabilizers, but they mainly build hips and back, so direct curls remain the better choice for arm size.

Yes, deadlifts work calves as stabilizing muscles, but they don’t replace direct calf exercises if you want stronger, fuller lower legs.

Yes, deadlifts train your core by making your abs and back brace hard to keep your spine stable during the lift.

Deadlifts do work the upper back by training the traps, rhomboids, and spinal erectors, but they pair best with rows or pulls for full development.

Yes, deadlifts work your back by loading the spinal erectors, lats, and upper back while also training hips, hamstrings, and core.

Yes, deadlifts work your back by training the spinal erectors, lats, traps, and core while your hips and legs drive the bar from the floor.

Yes, decline push-ups do work the upper chest, as long as you use the right body angle, hand position, and control on each rep.

Decline sit-ups train your entire rectus abdominis, but they do not isolate the lower abs; hip angle and form affect where you feel the work most.

Yes, delay sprays can help some men last longer by numbing the penis, though they do not treat every cause of premature ejaculation.