cardio 1hour 15min Friday morning

I don't have morning class on Friday. I went to gym this morning at around 8:00am. first, I did rowing for 20min, burned 170 Kcal. Then I did elliptical for 45 min, and burned 550 Kcal. At last I run for a mile in 12 min, burn 100 Kcal. I stretched for 10 minutes to end the session.
I tried to monitor my heart rate using the monitor of the machine. But the the monitor of the machine does not work well. I will remember to bring my own monitor next time. It is very important to keep the heart beat rate for cardio training.