We all know it's not good to sit for too long, but I sew for a living and sometimes it is unavoidable. These days I am feeling there is too much pressure on the back of my thighs close to the edge of the chair ... and I guess elsewhere. I use a standard office chair with arms. Wondering if anyone has a good suggestion for gel (or something) pads to eliminate pressure points. I've even thought about looking at hospital supply outlets, but would love to know what YOU use.