POLAR S610i - Manual (Page 44)

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1. Start from the Time of Day display. Press OK to enter the Measure mode.
2. If you want to swap the preset exercise set, press and hold the up
button until the exercise set (E1-E5) is swapped. Release. Repeat until
desired exercise set is displayed.
3. To start exercising and recording the preset exercise type press OK.
In this mode you can also use the functions in "Exercise Recording Mode"
section.
The Interval Trainer automatically guides you through your exercise. In
order to hear the activity sounds when the phase starts and stops make
sure the activity/button sound is on. If you have turned the countdown
timer of the phase off, you have to stop the phase manually by pressing
and holding the OK button. When the stopwatch starts running
indicates that Interval Trainer is on. As the interval training exercise ends
the receiver automatically starts a BasicUse exercise, which is recorded to
the same file as your interval training exercise.
Exercising with Interval Training Set (Int On, E1-E5)
Starting an Exercise Set