What is the FITT principle recommended for the time that will give you the most benefit from your cardiorespiratory workout?

The FITT principles are an exercise prescription to help participants understand how long and how hard they should exercise.

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Sports Training Principles

FITT is acronym that stands for Frequency, Intensity, Time, and Type. FITT can be applied to exercise in general or specific components of exercise. For example, below are some general FITT guidelines for weekly exercise.

Frequency: Daily moderate exercise is ideal, but try to exercise a minimum of 3-5 days per week.

Intensity: Moderate to vigorous intensity exercise is recommended for adults.

Time: 30-60 minutes per day.

Type: To maintain a well-balanced fitness level, perform a variety of exercises included cardio, strength, and flexibility training.

Think of The FITT principle as a set of rules that must be adhered to in order to benefit from any form of fitness training program.

These rules relate to the Frequency, Intensity, Type and Time (FITT) of exercise…

These four principles of fitness training are applicable to individuals exercising at low to moderate training levels and may be used to establish guidelines for both cardiorespiratory and resistance training.

The FITT principle is used to guide the development of unique and bespoke fitness plans that cater for an individual’s specific needs.

Frequency

Following any form of fitness training, the body goes through a process of rebuild and repair to replenish its energy reserves consumed by the exercise.

The frequency of exercise is a fine balance between providing just enough stress for the body to adapt to and allowing enough time for healing and adaptation to occur…

CardioRespiratory Training
The guidelines for cardiorespiratory training (also called aerobic conditioning) is a minimum of three sessions per week and ideally five or six sessions per week.Experts suggest that little or no benefit is attained over and above this amount. Of course athletes often fall outside the suggested guidelines but even elite performers must give themselves time to rest.

Resistance Training
The frequency of resistance training is dependent upon the particular individual and format of the program. For example, a program that works every body part every session should be completed 3-4 days a week with a day’s rest between sessions.On the other hand, aprogram that focuses on just one or two body parts per session, in theory you could be completed as frequently as six days per week. Many bodybuilders follow such a routine.
Remember though, each time you complete a strenuous strength training session (regardless of the body part) you are taxing your body as a whole – including all the physiological systems and major organs.

INTENSITY

The second rule in the FITT principle relates to intensity. It defines the amount of effort that should be invested in a training program or any one session.

Like the first FITT principle – frequency – there must be a balance between finding enough intensity to overload the body (so it can adapt) but not so much that it causes overtraining.

Heart rate can be used to measure the intensity of cardiorespiratory training. Workload is used to define the intensity of resistance training.

Cardio Respiratory Training
Heart rate is the primary measure of intensity in aerobic endurance training. Ideally before you start an aerobic training program a target heart rate zone should first be determined. The target heart rate zone is a function of both your fitness level and age. Here’s a quick method for determining your target heart rate…

Heart Rate & Maximum Heart Rate
Heart rate is measured as beats per minute (bpm). Heart rate can be monitored and measured by taking your pulse at the wrist, arm or neck. An approximation of maximum heart rate (MHR) can also be calculated as follows: MHR = 220 – age.

Target Heart Rate
For beginners a target heart rate zone of 50-70 percent of their maximum of heart rate is a good place to start. So if, for example, you are 40 years old that gives you a predicted maximum heart rate of 180 (220 – 40). Multiply 180 by 50% and 70% and your reach a target zone of 90bpm – 126bpm.

For fitter, more advanced individuals, a target heart rate zone of 70-85 percent of their maximum of heart rate may be more appropriate. Staying with the example above, that 40 year old now has a heart rate zone of 126bpm – 153bpm.

There are limitations with heart rate and the heart rate reserve method, while no means flawless, may be a more accurate way to determine exercise intensity.

Resistance Training
For resistance training, workload is the primary measure of intensity. Workload can have three components:
1. The amount of weight lifted during an exercise
2. The number of repetitions completed for a particular exercise
3. The length of time to complete all exercises in a set or total training session
So, you can increase workload by lifting heavier weights. Or you could increase the number of repetitions with the same weight. Finally, you could lift the same weight for the same number of repetitions but decrease the rest time between sets.

However, only increase the intnesity using one of the above parameters. Do not increase weight and decrease rest time in the same session for example.

TYPE

The third component in the FITT principle dictates what type or kind of exercise you should choose to achieve the appropriate training response…

Cardio Respiratory Training
Using the FITT principle, the best type of exercise to tax or improve the cardiovascular system should be continuous in nature and make use of large muscle groups. Examples include running, walking, swimming, dancing, cycling, aerobics classes, circuit training, cycling etc.

Resistance Training
This is fairly obvious too. The best form of exercise to stress the neuromuscular system is resistance training. But resistance training does not neccessarily mean lifting weights. Resistance bands could be used as an alternative or perhaps a circuit training session that only incorporates bodyweight exercises.

TIME

The final component in the FITT principle of training is time – or how long you should be exercising for. Is longer better?

Cardio Respiratory Training
Individuals with lower fitness levels should aim to maintain their heart rate within the target heart rate zone for a minimum of 20-30 minutes. This can increase to as much as 45-60 minutes as fitness levels increase.

Beyond the 45-60 minute mark there are diminished returns. For all that extra effort, the associated benefits are minimal.

This also applies to many athletes. Beyond a certain point they run the risk of overtraining and injury. There are exceptions however – typically the ultra-long distance endurance athletes.

In terms of the duration of the program as a whole, research suggests a minimum of 6 weeks is required to see noticeable improvement and as much as a year or more before a peak in fitness is reached.

Resistance Training
The common consensus for the duration of resistance training session is no longer than 45-60 minutes. Again, intensity has a say and particularly grueling strength sessions may last as little as 20 – 30 minutes.

Perhaps the most important principle of training (that ironically doesn’t have it’s own letter in the FITT principle) is rest. Exercising too frequently and too intensely hinders the body’s ability to recover and adapt. As a rule of thumb, the harder you train, the more recovery you should allow for. Unfortunately many athletes don’t have that luxury!

Sports Training Principles

The FITT principle is designed more for the general population than athletes.

Sport-specific training should be governed by a more in-depth set of principles. These include:

Specificity
Overload
Adaptation
Progression
Reversibility
Variation

For a more detailed look at the the principles of training for athletes, see the excellent “Sports Training Principles” (1997) by Frank Dick.

FITT stands for Frequency or how many times per week you are doing the exercise. I, stands for intensity, which is how hard the activity is being done. T, is for time, which mean how long is each exercise session. The last T stands for Type, which means are you using a bike, a stair climber or a treadmill.

The FITT acronym can remind you to slightly alter the Frequency, Intensity, Time (duration), and Type of exercise you do, as you are able, to steadily improve your physical fitness. Cardiovascular aerobic exercise, or “cardio,” is one of three main types of exercise. (The other two are strength training and stretching.) It is any repetitive, rhythmic exercise that increases your heart rate and requires you to use more oxygen. These FITT guidelines can help you stay on track for fitness in the cardiovascular aerobic exercise component of your overall exercise plan.

Cardiovascular aerobic exercise FITT guidelines:

Frequency: 5 times per week
Intensity: Warm up for 5 minutes. Then do moderate-intensity activity, making sure you can pass the “talk test” - that is, the exercise is not so intense that you cannot converse with someone else. Cool down for 5 minutes.
Time: Exercise for at least 10 minutes at a time, with a goal of at least 30 minutes per day (more is even better, if tolerated).
Type: any activity that raises your heart rate for at least 10 minutes, such as walking, bicycling, jogging, swimming, vacuuming, scrubbing, shoveling, etc.

Don’t forget to add strength training and stretching to your exercise program as well. Remember: you should discuss your exercise plan and fitness goals with your physician before you begin.

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.