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After a few weeks, you can occasionally incorporate Zone 3 and Zone 4 intensities for short periods of time. Remember, when you begin to incorporate Zone 3 and Zone 4 intensities, you will find that you will likely have to drop down to Zone 1 intensities shortly thereafter as brief recovery periods. For variety, you can spend a little bit of time in each of the four Zones during one workout, and then spend your time in just one Zone during the next workout. Prenatal woman should always remain at