My left side oblique has been hurting under the floating rib for three days now. I did my research and it sounds just like your basic deep oblique muscle strain, an injury that commonly affects athletes and bodybuilders...but here I am having gotten it from sitting for long periods of time at work. My little muscles are used to walking, sitting in cars, getting out, walking, etc. Now, I mostly sit at a computer doing data entry for 10 hours. casual items for the mother of the bride to wear in the summer