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Originally Posted by Stew
This is a great thread. I was very active in the service, sort of relaxed quite a bit for the year after I got out, and now am getting back on the saddle.
Diva, if you could settle a question for me once and for all, are sit-ups bad for you? Not crunches, the full sit-up. The Army's PT test is designed around this exercise, which means that most exercises for the military are as well. I got to the point where I was able to do like 100+ situps in 2 minutes, but still in my early 20s, I'm now "enjoying" chronic lower back pain. I'm sort of trying to pinpoint what is the main source of this. My job was highly physically intensive, so it could be many things, but I'd curious if there's a conventional wisdom in the physical trainer field that says sit-ups are bad.
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Sit-ups in and of themselves aren't bad, but because so many people don't know how to do them properly they can cause lots of injuries. My guess, based on what you've posted, is that it could be a few things. First, you haven't mentioned if you've done any back exercises. Doing 100+ sit ups and no back work will leave your body lopsided. Your lower back will be underdeveloped and unable to support your body properly as you do the sit up. As I mentioned earlier in the thread, when doing a crunch or sit up, you want to minimize the arch in your lower back by drawing in your belly button, stabalizing your core. The drawing in motion utilizes both the abs and the lower back. While lying on the floor, your back should be as close to flat as possible. As you sit up, you need to maintain that stabilization and bend at the hip. What usually happens, and why people get hurt, is that their back isn't strong enough to support the body and as people contract their abs to sit up, their back can't maintain the postion and begins to arch. As anyone who's snapped a twig knows, there's only so much it can bend before it snaps. Similarly, too much pressure on an arched back can cause pain.
Secondly, doing timed sit-ups encourages bad form. You'll be more inlcined to sacrifice form in order to get those extra reps in. You mentioned this is something the military requires, but its just highly discouraged by most fitness professionals. As for your job being highly physical, my description of how both your abs and lower back need to be utilized to stabilize your torso is still relevent. You want to make sure that your back is supported properly while doing any phsyical activity.
Barring any major physical disabilities as diagnosed by a physician, you can reduce or even eliminate your back pain by doing back exercises. If the pain is indeed caused because your back muscles are underdeveloped, doing exercises to target them specifically will help develop them. Also, lower back pain can also be caused by weak hamstring muscles. They are connected to the lower back and hip and will put stress on your back if they are tight. Hamstring stretches are easy and can be done daily.
The easiest lower back exercise that you can do at home is the Superman. It's just as it sounds -- lie on your stomach, arms extended in front of you. Engaging your back muscles, raise your arms, legs and chest off the floor. Hold for a few seconds. Relax and repeat. On your last rep, see if you can hold the raised position for 30 seconds. To really target the various muscles in your lower back, start in the same position as the Superman, but lift opposing limbs (e.g., the left arm and right leg). You can push down with the hand that is on the ground to help raise your other arm and chest higher off the ground.