Super-Slow High Intensity Training For Personal Trainers

High Intensity training (H.I.T.) is a popularized strength training routine that has evolved since the 1970's. It was properly advocated by Arthur Jones, the founder of Nautilus and MedX resistance training equipment, and has since been highly supported by bodybuilding champions such as Mike Mentzer and Casey Viator, SuperSlow founder Ken Hutchins, exercise guru Dr. Ellington Darden, and many others around the globe.

H.I.T was seen as a radical form of weight training back when bodybuilding, and strength training in general, was a highly participated form of exercise. This article will introduce you to the concepts behind H.I.T and seek to provide a physiologic reasoning behind why this method of training is just as effective as conventional strength training.

High Intensity Training



Superslow High Intensity Training consists of the following principles:

  • Train for time, not for reps. 60 - 90 Seconds
  • Train Slowly. 5 - 10 secs lifting and lowering
  • One set per exercise. No warm-up sets
  • Train briefly.... 8- 10 exercises per session. 8 - 10 sets per session maximum
  • Train infrequently. Once every 4 - 10 days



The two categories of exercise (aerobic and anaerobic exercise) are primarily defined in terms of intensity and duration. Aerobic exercise is low intensity/ high duration, and anaerobic exercise is high intensity/ low duration. The saying goes, "muscles can't count repetitions", and this is primarily because muscles only respond to intensity and duration. Most strength training studies have concluded that a set of exercises should last between 60-90 seconds for an effective strength training stimulus. This method of training is popularly known as ‘time under tension' or ‘time under load' (TUL) model.

This being the case however, it takes nothing away from repetition count, as repetition count is a great goal-orientated focus to strength training and can provide pivotal motivation to complete a set of exercises. However, if a trainer is training by reps, keep in mind the tempo of each repetition as it is easy to do 10 repetitions in 30 seconds (1:2 tempo), or to do 10 repetitions in 60 seconds (3:3 tempo). As the 10 repetitions at 3:3 tempo is in the 60 - 90 second range, it will prove a more effective workout than the former.



There is still much debate over the potential benefits slow training has over fast training, and vice versa. However here is the logical view!

Slow repetition training is termed as (at minimum) 5secs on the concentric phase and 5secs on the eccentric phase (however some H.I.T trainers go up to 10secs each way!). These slow repetitions are infinitely beneficial as they:

  • Absolutely remove any momentum that would help you move the weight (or cheat the exercise!).
  • Dramatically loads the muscle as effectively as possible (due to decreased momentum), resulting in higher musculature recruitment of type II fibres.
  • Properly loads the applied weights resistance on the muscle and takes unnecessary loading off the joints (especially on the eccentric phase), resulting in a safer and more effective exercise.
  • Allows you to actually push/pull a heavier weight due to a stronger muscular contraction at the muscle's structural level.
  • Allows for more powerful muscle activation at greater joint ranges and significantly develops muscular strength over every segment of the strength curve, resulting in reduced risk of injury.


Strength training is about overloading muscles so that they respond and become stronger. Advocates of slow repetition training define it as ‘intelligent strength training' because it properly overloads the muscle with maximum resistance throughout every centimetre of the movement.




Again, set programming is another major source of confusion in the fitness industry. The main reasoning behind single-set training is that, at the end of the day, the human body responds to stimuli, and it internally adapts to the external environmental stresses applied to it. In terms of strength training, we seek to provide the most effective stimulus we can to stimulate the muscle to essentially become a stronger muscle before the next gym session.

If we think about the human body as being an electrical structure (in which it already is), we can appropriately compare it to a lift in an office building. Whilst waiting for a lift, one worker decides to press the button once and patiently wait for the lift to come, which it will because the stimulus has been triggered. The other worker, in desperate need to get a fast result (the lift to come down), presses the button three times very quickly. The same outcome (stimulus) has been achieved, yet the worker who frantically pressed the button three times has essentially just wasted time (and effort).

The only logical benefit that single-set training has is that it allows for 100% of your muscle's available resources to generate the greatest possible stimulus in one maximum effort, as it would not have been fatigue from any prior sets, and would have no drawbacks because you (as a trainer) would not be saving your energy for the next set to come.



If we return to the definition of aerobic exercise, we re-enforce the fact that it is a workout performed at a low intensity for long durations. Logically we can then say that:

  • The less exercises we perform in a workout then...
  • The higher the intensity we can work at in those particular exercises, so.....
  • The higher the stress we put on the body, which means.....
  • The greater the stimulus we generate, which will prove to be....
  • The more effective the workout, and....
  • The greater the benefits!


8-10 exercises at maximum was the recommendation by Arthur Jones, who stated that you should perform no more than 2 exercises per muscular group, and no more than 8-10 exercises in a workout routine. Once you perform 8 exercises at a high intensity (slow, in good form, and until muscular failure) you will (and should be) absolutely exhausted, which therefore leaves you to achieve nothing but sub-maximal efforts on the rest of your exercises (which is generally a waste of time!).



The main consensus surrounding strength training frequency is the following:

  • Perform strength training 2-3 times per week.
  • Once you become more advanced, increase the amount of sessions per week for maximum benefit.

High Intensity Training almost has the exact opposite view, which basically suggests the following:

  • Perform strength training 2-3 times per week.
  • Once you become more advanced, decrease the amount of sessions to once every 4-10 days.

Have you ever needed to take a whole week off your normal strength training routine to come back and find you haven't lost any strength, and that you are actually a little bit stronger than what you were last session? It mainly due to the fact that this time you have given your muscles more adequate time to rest, recover and grow stronger.

The more advanced you are as a trainer, the higher the intensities you train at, and this isn't because you are doing heavier weights, it is because you are more able to push through the mental and physical pain barriers thereby placing greater stress on your muscles.

As the saying goes, "your muscles don't get stronger lifting weights, they get stronger in the resting days after you train". Exercise scientists are not yet able to say exactly how long our muscles should rest in order to produce the most positive training adaptation before we train again. It only makes sense to H.I.T trainers that the higher the intensity you train, the more rest you need in order to gain the most beneficial growth production period.



Superslow High Intensity Training is an intelligent strength training routine. It requires you to properly load your muscles without the influence of momentum and intelligently do what nature requires to stimulate the adaptation mechanism into motion.

Plenty of trainers around the world have benefitted enormously from Superslow H.I.T., however, in terms of scientific research, plenty of articles have shown there is no significant difference from the benefits of doing either single-set H.I.T or conventional multiple-set strength training.

H.I.T. is simply a different way to train, a more advanced way to train..... but is also smarter and more safer way to train. Give it a go, and you be the judge!

Topics: Gym, Success, Working Out, Fitness, Tips

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