Can you really do any abwork worth a darn after the first trimester? I know you don't do anything supine and can do crunches (et al) on a slant board. Also, I'm thinking I've read that you can do planks and isometric exercises, etc. BUT, does it really matter?? When your abs are all stretched out like that, is the work doing any good? Or, is this the equivalent of a "sugar pill"? Just asking. Robin.