Core training doesn't sound sexy but in fact plays an important role for bodybuilders, especially if you train with very heavy weights. Your midsection - your abs and lower back - is the
foundation upon which the rest of your body revolves, at least from a mechanical standpoint. Without a strong midsection you'll never be able to maintain your form on heavy squats,
bent-over rows or deadlifts - movements that really build maximum muscle.
You probably spend a considerable amount of time on ab-training but very little on your lower back. No matter whether you lift weights for strength, performance or simply to look good, you can't afford to neglect this crucial muscle group.
The lower-back muscles, collectively known as the erector spinae, work with and in opposition to the abdominal muscles. When contracted, the erectors and abs form a natural weight belt around your entire midsection. This belt serves to protect your spine and provide a rigid attachment point from which other muscle groups can function.
Much like your abs and calves, your erectors are an endurance muscle group that is resistant to fatigue. You have to work them with slightly higher reps to fatigue them sufficiently. Train your lower back at the end of your workout. Hitting these core trunk muscles early weakens your midsection, thus impacting all movements that follow. Safety becomes an issue as the risk of injury increases.
Back extensions, good mornings and stiff-leg deadlifts are effective lower-back movements. Some gyms have machines to target this area. Regardless of your method you must include specific exercises in your routine to strengthen your lower back.
There's more to your body than beach muscles. While the muscles of the lower back aren't highly visible, we can't overstate their importance. Without proper lower-back training you're trying to build upon a foundation that isn't rock solid.