Here is a variation on obliques. Lie on your left side. Crunch sideways up while at the same time bringing your bent legs u. On leg rests on top of the other. Keep your hands behind your head, elbows "open". Face forward. Imagine your right elbows trying to touch your right ankle. Repeat for four sets of ten repetitions. Repeat while lying on your right side for your left oblique.
Disclaimer: None of the above information can be taken as a substitute for advice from a medical professional such as a physician.
My third book, Pocket Guide to Fitness, is available on www.louizapatsis.com, http://www.authorhouse.com, www.bn.com and http://www.amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.