P90x ab ripper x hard on back?
This is my first week on p90x. I'm finding that the ab ripper is very hard for me in part due to my back. I do have some history with "minor" back injury. I'm not sure if this is to be expected at first, maybe my form is off? I find that the v up roll ups are specifically hard on my back.
Any ideas, modifications, or input would be welcome.