10. You don’t get enough rest
Sleep is when muscle repair happens, so getting six or fewer hours of shut-eye a night limits your body’s natural production of crucial muscle-building chemicals like growth hormone. Too much activity outside of your workouts, or even extra stress—which is permissible now and then, but dangerous in excess—also cut into muscle gains.
And if you’ve been working out seven days a week, we’ve got another pleasant surprise for you: You’ll lose muscle for sure. Such a high frequency won’t allow for regeneration, and your efforts will be wasted. And no, it doesn’t matter if you’re training different muscle groups each day—you still have the same central nervous system, and it still gets tired of having to deal with major physical exertion every day.
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