Funny, I thought that women who routinely exercise, e.g. runners, can run/exercise at a normal level throughout most of their pregnancy?
True. You are advised not to take up new regimes and weight training. My sister barely looked pregnant in any of her pregnancies (she's not some 29 stone behemoth either) but people refuse to believe I'm not further along than I am because I blow up! I look at least 35 weeks and I am only 28.