Many pregnant women have asked me if it’s safe to work your abdominals.  With healthy pregnancies it is typically safe to do traditional ab work (i.e. lying on your back) up till week 12.  After week 12 it is no longer recommend to lay on your back.  However, you can still work your abdominals without laying on your back. 

Try this simple exercise to strengthen your abdominals:

On all your knees on all fours, head in line with the spine bring one knee in towards your chest.  Hold for 2-3 counts.  Release and repeat 10-15 times.  Then repeat on the other side.  Work up to 2 sets of 10-15 reps.