#295--Take your heart rate first thing in the morning for 30 seconds. Do this for a full week to get a baseline number against which you can compare future morning heart rates. If the number stays the same or goes up by 1-3 beats, continue with your workout as planned. If your heart rate has increased by 4 beats, you should cut the volume down by half. An increase of 5 beats or more, and your body is begging you to rest--it's time to work in.