I am almost 23 weeks and after a horrendous 16 weeks of sickness I'm feeling better and want to get back to exercise. I went for a walk the other day (well, I walked home) and it's quite an uphill walk. I wasn't really out of breath but my heart was definitely faster than it used to get when I did the same walk. Are there women out there doing moderate to intense exercise when pregnant and were told it is safe? What I did was NOT intense exercise, but given my heart rate at the time it did feel a little harder than usual.