POLAR S610i - Manual (Page 49)

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In this mode you can also use the functions in "Exercise Recording Mode"
section.
Starting the Timers
If timers are set on, they automatically start running once you start the
stopwatch. Timers alternate in the following order: timer 1, 2, 3, 1, 2, 3, etc.
At the end of timer 1 you will hear 1 beep, at the end of timer 2 you will
hear 2 beeps and at the end of timer 3 you will hear 3 beeps. Timers stop
running when you stop the stopwatch.
Exercising with BasicSet (Int OFF, E1-E5)
Interrupting an Interval Training Exercise
1. Press the stop button to pause the exercise.
2. Press and hold the stop button to return to the Time of Day display.
Or
Press the stop button. BasicUse appears. You can continue measuring your
heart rate in this mode (Measure mode). To continue exercising with
BasicUse and recording your exercise information press OK. You can
continue using and swapping the same heart rate limits of the previous
exercise. Repeat steps 1 and 2 to return to the Time of Day display.