As you progress through your 3rd trimester, you'll be asking your heart to work continuously harder. That's all right-your heart can take it, as long as you don't have heart disease. There's no need to curtail your exercise if your heart rate increases; it's normal that if you work hard, your pulse will go up.
"Vigorous" exercise means different things for different people. Vigorous exercise for a sedentary woman may be only a warm-up for a marathoner. What's important is that you avoid pushing yourself too hard; "too hard" means to your own point of discomfort. It's OK if you notice your breathing speeding up as you exercise, but you shouldn't be pushing so hard that you can't talk. Listen to your body. Any kind of movement is good, even if it's slower and less intense than your prepregnancy and early-pregnancy activity.
Originally published in You & Your Baby: Pregnancy.
All content on this Web site, including medical opinion and any other health-related information, is for informational purposes only and should not be considered to be a specific diagnosis or treatment plan for any individual situation. Use of this site and the information contained herein does not create a doctor-patient relationship. Always seek the direct advice of your own doctor in connection with any questions or issues you may have regarding your own health or the health of others.