I've been in 7B (exit) on CRJs eight times recently. Several briefings included "throw the door to out to the back (aft)". I even learned about the lifeline, but it is for crew use only. There seems to be an extra inch or two of space in the exit row, plus the row in front does not recline so that helps with space. Most annoying was changing to row 7 with online check in, only to have them switch equipment to the CRJ with the extra row (CR4 I think), making 8 the exit row.