iPulseRate is a great tool to keep track of your pulse during different times of the day. Measure your pulse before, during and after exercise and see it graphed as you work out using the camera and flash on your iPhone 4. Save and refer back to your old pulse measurements to measure your progress over time.
Your target heart rate is calculated using your age and sex and can be displayed on your the graph as you work out along with your target zones.
For best operation place your finger lightly over both the camera and flash for an accurate measurement. Pressing too hard will not allow blood to flow through the measured area. Changing the position of your finger will cause iPulseRate to recalibrate.
Continued use of the flash may dramatically decrease battery life.