While this form of consistent and safe training can generate many health benefits, including better cognition and improved quality of life, lifting weights every day does not give your muscles that critical rest period that they need, resulting in a number of negative symptoms (per Livestrong). As it turns out, your muscles don't actually get stronger while you're pumping iron — they get stronger during those rest periods in between workouts. Credit goes to a process called protein synthesis. During this process, the body's cells make proteins, which encourage the growth of strong muscles.
When you fail to give your muscles at least one day of rest between heavy workouts, it decreases the amount of time that your body's cells have to recover and form new proteins. If one muscle group is especially sore, it's because it is still recovering from the tough workout that you put it though earlier. In other words, fighting through soreness does your body no favors.
To avoid the negative symptoms of lifting weights everyday, like excessive fatigue, reduced performance, mood and sleep disturbances, and nagging injuries, try to give each muscle group at least one day of rest between each weightlifting workout.
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