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Many would argue that compound exercises such as squats are more beneficial but deadlifting is one of the best compound exercises you can do to increase strength and muscle mass. It works virtually every muscle, with emphasis on the quadriceps, hamstrings, gluteus maximus and most muscles of the back and also the forearms.
Traditional vs. Sumo. While both variations emphasize the back side, the traditional deadlift typically sends the lifter into a more bent over posture since the feet are closer together. This may be okay for some but those with a weak lower back may find that the traditional variation gives them some slight back aches.