I can do practically everything there is to do here but i really must avoid pushups and crunches due to a back problem i have. Can you suggest an alternative to these. I too want to get nice abs but i cant perform these exersizes!
Planks and side Planks will help strengthen your core, which is way better than getting well defined abs in my opinion.
But if its ab definition you're looking for then try the Sunrise, Sunset. It will engage your whole upper body but if you choose a lighter weight the strain on your back should be minimal. Give it a shot and if it doesn't workout planks are your only option.
Can't think of an ab workout that doesn't involve the back.
Well, you can do planks, spiderman plank, side plank, russian twist
How about push ups against a wall? Have you tried them? They may be easier on your back. And rather than crunches have toy tried legs raises/lifts and scissor legs? They don't require you to bend you're back.
It's hard to recommend something without knowing the extent of your back problem and your limitations.
Most ab exercises will require you to use your back unfortunately, what you can also do is to always engage your core while doing other lower and upper body exercises..so if you do bicep curls for example contract your stomach and to make it more intense do it on an uneven surface like a BOSU ball. Also start off with 30sec planks rather and work your way up to 1min..as everyone else mentioned before this will definitely strengthen your core
I also have a back issue and I find push ups very stressful on my back. I prefer to do dumbbell bench press with my feet on the bench (takes stress off lower back) instead. As for the crunches I'm not really sure, I do crunches with a few rest days in between so my back has time to recover. Instead of crunches, you could do elbows to knees standing up maybe? Hope this helped