Interval Training
Lack of time is the number one reason people give
for not exercising. And lack of results once they do
start exercising isn't far behind. Interval training is
a great solution for both of these common problems.

Interval training involves alternating short bursts of
intense activity with what is called active recovery,
which is typically a less-intense form of the original

The Swedes came up with a term for this type of
training: fartlek, which means speed play. Not only
is it an efficient training method, fartlek training
can help you avoid injuries that often accompany
non-stop, repetitive activity, and provides the
opportunity to increase your intensity without
burning yourself out in a matter of minutes.

Unlike traditional interval training, fartlek training does not involve specifically or
accurately measured intervals. Instead, intervals are based according to the needs
and perceptions of the participant. In other words, how you feel determines the
length and speed of each interval.

The advantages of intervals

Interval training utilizes the body's two energy-producing systems: the aerobic and
the anaerobic. The aerobic system is the one that allows you to walk or run for
several miles, that uses oxygen to convert carbohydrates from various sources
throughout the body into energy.

The anaerobic system, on the other hand, draws energy from carbohydrates (in the
form of glycogen) stored in the muscles for short bursts of activity such as
sprinting, jumping or lifting heavy objects. This system does not require oxygen,
nor does it provide enough energy for more than the briefest of activities. And its
byproduct, lactic acid, is responsible for that achy, burning sensation in your
muscles that you feel after, say, running up several flights of stairs.

Interval basics

Interval training allows you to enjoy the benefits of anaerobic activities without
having to endure those burning muscles. In its most basic form, interval or fartlek
training might involve walking for two minutes, running for two, and alternating
this pattern throughout the duration of a workout.

The intensity (or lack thereof) of each interval is up to how you feel and what you
are trying to achieve. The same is true for the length of each interval. For example,
if it is your habit to walk two miles per day in 30 minutes, you can easily increase
the intensity of your walk (as well as up its calorie-burning potential) by picking up
the pace every few minutes and then returning to your usual speed.

A great trick is to tell yourself that you'll run a particular distance, from the blue
car to the green house on the corner, for example, and then walk from the green
house to the next telephone pole.

When you first start fartlek training, each interval can be a negotiation with
yourself depending on how strong or energetic you happen to feel during that
particular workout. This helps to break up the boredom and drudgery that often
comes from doing the same thing day after day.

A more advanced approach

Despite its simplicity, it also is possible to take a very scientific approach to interval
training, timing both the work and recovery intervals according to specific goals.
The box, lists the four variables to keep in mind when designing an interval
training program.

Consider the following four variables when designing an interval training program:

Intensity (speed) of work interval

Duration (distance or time) of work interval

Duration of rest or recovery interval

Number of repetitions of each interval

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