Interval Timer mode is a handy feature for athletes who do structured, timed training sessions. For instance if you do timed repetition work, say 3 minutes "on", 2 minutes "off" repeated 8 times, then this feature can signal when to start and stop for the duration of the session.
Many sports watches have a Countdown Timer feature, but this is a more limited form of timer. It simply counts down from a specified time to zero, sounding an alarm, then stopping or repeating the countdown sequence once again. While it can be used in training, it requires that the effort and recovery periods are the same.
An Interval Timer on the other hand, is a sequence of timers running in sequence. Once one timer has run it's course, the next timer in the sequence begins and then when it finishes the next begins and so on.
Most good sports watches support at least two interval timers, and some even have more than two. My Timex Datalink Watch for instance supports a maximum of 10 sequential countdown timers, allowing me to set it up for some advanced sessions indeed.
For most athletes, two timers is you will likely use. A timer for the effort part of the session and another timer for the recovery. The important thing to check for that it is supported at all in the watch you are eying off to purchase.
While, this feature can be a little tricky to get your head around at first, and might require a little practice to learn. Once mastered it can be used, not just as training aid, but in all areas of life. Like work. You might want to work for a fixed amount of time before you take a break. Say 45 minutes of work, followed by a 10 minute break.
If you tend to get sidetracked like me, it is the perfect solution, both on the track and in the office!
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