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i was injured a few years ago on a job falling threw a roof. 2 years later a sneezed and couldn't stand on my leg. sharp pain inthe lower back. Now its as been a year and it's back, sciatica is a pinch in the sciatic nerve. This make it really hard to work my abdonimals, it also makes it hard to work the hip and lower body in general, and sometime even walking is difficult. what exercise could i do to keep up the good work on my abs and legs, without forcing on the lower back too much, should i concentrate on upper body and hope the nerve places itself or simply not do any activities at all. wouldn't that ruin the rest of my health and progress?

You need competent medical support. In the long run you must work your abs, lower back and lower body or it will get worse. In the short term, doing the wrong exercise could be painful and may set you back further. You should get medical advice on how to procede. An MRI would probably give your doctor the details you need to know how to proceed.

yep like straigh leg deadlift are hard to accomplished but leg extension or leg curls are not as bad

Assuming that you have had it all checked out by medical professionals etc?

Personally I swear by my inversion table, have a search for those made by Teeter, they have been tested and proven strong enough for you do do sit ups on them while hanging upside down by your ankles. That allows you to train your abs without stressing your back. Also as they gently stretch the spine they promote healthy discs. Even at a slight incline the stretch feels amazing to me and has helped stop the twinges I used to get from sitting at a desk all day.

If you haven't already get yourself assessed by an orthopaedic surgeon or my pick a neurologist but here a few tips. Sciatica is an overused term and commonly abused term and pinched nerve doesnt really fit the bill in all cases. There are many different conditions which might cause similar symptoms, piriformis syndrome being the first off the list, ankylosing spondlitis another. Given your history of a back injury I wouldn't be surprised if you have a lesion restricting nerve travel about one of the lower nerve root exits. As for exercise well sit ups will exacerbate the problem, as will back extensions especially if you still have disc involvement. Back extensions and sit ups are probably two of the worst exercises for a healthy back let alone a compromised one. This is from a rehab persective and a health persepctive not a competitive or sporting angle. The evidence backs this up. Strengthening is also secondary to muscular endurance when it comes to back health (again from the same perspective). Ask a physio about nerve flossing to alleviate sciatica and if they dont know what it is go elsewhere. I would cetainly get a referral to a specialist and an MRI to determine the root cause (pun not intended) and seek a solution, surgical or otherwise.

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B.App.Sci (Ex.Phys)
M.Clinical Rehabilitation