Keep An Eye On Your Heart Rate

Women should work out at 75-85% of their maximum heart rate. When your heart rate is too low, it's a sign that you're not working to your full potential. Too high a rate, on the other hand, shows that you're pushing yourself to a potentially dangerous level. Keep a heart rate monitor on hand or do a manual count incrementally during your workout to ensure that you're reaching, but not exceeding, your ideal target heart rate.