yes of course, the abdominal muscles are the support muscles for the lower back. Get the Abs in shape and you back will feel better also. DO NOT expect a overnight result, but you will feel the muscles working from the first time. Give it 90 days not skipping if you can and you will feel much better, not to mention have flatter abs.
Yes.... shoulders and back... mostly upper back but the lengthening you get when you do a full outward stretch.... yes, you're whole back gets it!
Yes. It will also help get rid of back fat.
that would be a big yes, my back is sore this morning,
from useing ab carver yesterday,
answered 5 months, 3 weeks ago