Hi

My OB said the same thing as pregpan! "1. not to allow body to overheat 2. heart rate not to go too high (babies heart rate is a lot higher than yours and 3. do not start to suddenly become active if you werent before."

So that said she told me swimming and walking, make sure i keep heart rate below 145bpm and stop when i get tired!!Oh and to keep exercise to 3-4 times a day max!

hope this helps