After discussing progressive overload and the role of recovery in the previous articles, we now arrive at another concept that is frequently misunderstood in strength training: the difference between fatigue and stimulus. Many people assume that the more exhausted a workout makes them feel, the more productive it must have been. This belief has become deeply embedded in gym culture, where soreness, exhaustion, and the inability to move a muscle afterward are often taken as proof that a workout was effective. However, while effort is necessary for muscle growth and some fatigue is unavoidable, fatigue itself is not the objective of training. The objective is to deliver an effective stimulus to the target muscle so that it adapts and grows. When fatigue becomes excessive relative to the stimulus provided, the workout becomes inefficient.

This misunderstanding has influenced the way many people design their workouts. In an attempt to build muscle as quickly as possible, trainees often perform large numbers of sets, include many exercises for the same muscle, and push nearly every exercise to its limit while choosing movements that require enormous effort from almost the entire body. These workouts may feel extremely demanding, but the amount of growth stimulus they provide is not always proportional to the fatigue they generate. In other words, the body may be paying a high energy cost with relatively little reward for the muscles we are trying to develop.

Muscle growth is influenced by several physiological factors working together, including effective mechanical tension on the muscle fibers, adequate time under tension, meaningful muscle fiber recruitment, appropriate training frequency, and intelligent exercise selection. Fatigue is only one part of this process. When fatigue becomes the main focus of training rather than the quality of muscular loading, workouts often become less efficient and recovery becomes unnecessarily prolonged.

This leads to an important concept that is often overlooked: there is a point during a workout where additional effort no longer contributes meaningfully to muscle growth. Once the muscle has received sufficient stimulation to trigger adaptation, continuing to add more sets or more fatigue does not necessarily increase the hypertrophic signal. Instead, it may simply increase the amount of fatigue the body must recover from. Beyond this point, additional work becomes progressively less productive and may even interfere with future training sessions by extending recovery time unnecessarily.

Interestingly, this issue has been discussed for decades in bodybuilding and exercise science. In the early bodybuilding era, many athletes — including Arnold Schwarzenegger — trained with extremely high volume. Arnold often described routines where a muscle could receive fifteen to twenty-five sets in a single workout, sometimes spread across several exercises. Because these sessions could last for many hours, many bodybuilders split their training into two sessions per day, working out once in the morning and returning later in the afternoon or evening to train again. It is important to remember that many of these athletes were very young, often using performance-enhancing substances, and were living in an environment where training, recovery, and lifestyle revolved almost entirely around bodybuilding. Their recovery capacity, motivation, and daily routine were very different from what most people experience today. However, some researchers and experienced coaches began questioning whether this amount of work was actually more productive than a smaller number of intense sets. Several studies have suggested that sufficient muscular stimulation can often be achieved with only a few properly performed sets. Additional sets may increase fatigue and extend recovery time without necessarily producing a greater growth stimulus.

This reminds me of an example Doug often used when explaining this concept — the process of tanning in the sun. If someone spends a moderate amount of time in the sun, the skin gradually adapts and becomes darker over repeated exposures. However, if a person stays in the sun far too long on the first day, the result is a burn. Instead of continuing the tanning process the next day, the person must now wait for the skin to heal. The excessive exposure slows the overall progress. Training can work in a similar way. Stimulating the muscle enough to promote adaptation is productive, but excessive fatigue can delay the ability to stimulate that muscle again.

For this reason, the goal is not to create the maximum possible exhaustion in a single workout. The goal is to provide enough stimulus to encourage growth while managing fatigue so that recovery and future training sessions remain productive. This principle becomes even more important when we consider how different exercises affect fatigue and energy expenditure.

One of the most common beliefs in strength training is that compound exercises are the best way to build muscle. Movements such as the squat, deadlift, bench press, and shoulder press have long been considered the foundation of hypertrophy training. These exercises involve multiple joints and multiple muscle groups working together, allowing a person to move relatively large amounts of weight and stimulate several muscles simultaneously. Many people have built impressive physiques using these movements, and we cannot deny their role in strength development and athletic performance. However, these gains have often come with a price, as the heavy loads and systemic demands of such exercises have frequently been associated with a higher risk of joint stress and injury over time.

However, when the goal is specifically hypertrophy, it is important to examine whether compound exercises always provide the most effective stimulus for every muscle involved in the movement. Many people assume that with compound exercises all the muscles contributing to the movement are equally stimulated. But as many of you already know from experience, this is often not the case. Some muscles may end up doing more of the work while others contribute less, which is why many trainees feel the need to add additional exercises afterward to better target the areas they feel were not sufficiently trained. This means the body is expending a large amount of energy, yet the load is not always being directed efficiently toward every muscle participating in the exercise when the goal is hypertrophy. Over time, this imbalance in stimulation can require additional exercises to compensate, increasing the overall energy cost of the workout. In other words, the body may be investing a large amount of effort while the muscular stimulus is not distributed efficiently across the muscles involved.

For example, when performing a traditional bench press, the chest, triceps, and front deltoids all contribute to moving the weight. While the exercise can certainly stimulate the chest, the triceps and shoulders may often become limiting factors. In some individuals, the shoulders may fatigue before the chest receives its optimal stimulus, while in others the triceps may limit the movement. As a result, a large amount of effort is being invested into the exercise even though the intended target muscle may not be receiving the maximum possible tension relative to the energy being spent. When people try to push beyond this limitation by forcing additional repetitions with the help of a spotter, the same limiting muscles are still involved. The triceps or the front deltoids often remain the weak link in the movement, and pushing past that point can increase the stress placed on those structures. Over time, this may increase the risk of injury, something many people have unfortunately experienced in training. This does not mean we are trying to be overly protective, but it does highlight the importance of understanding how fatigue and mechanics influence the effectiveness of an exercise.

As people get older, this issue becomes even more important when selecting exercises. Maintaining muscle mass becomes increasingly important for health, metabolism, and long-term physical function. More muscle generally means a healthier body, because muscle tissue plays a key role in metabolism and energy regulation. At the same time, the ability to tolerate extremely taxing exercises often decreases due to joint stress, connective tissue limitations, or reduced recovery capacity. Exercises that require large amounts of systemic effort may become harder to perform frequently enough to maintain consistent muscle stimulation. As we discussed in the previous articles, training frequency is important for hypertrophy and for maintaining muscle, particularly when muscles can be trained again once they are recovered and ready to perform optimally. In this situation, the body may end up spending more energy recovering from the overall fatigue of the exercise than benefiting from the muscular stimulus it provides.

This does not mean that compound exercises are useless or have no place in a training program. They can still be valuable tools, particularly when used strategically at the right time or for athletic performance. However, when the primary goal is hypertrophy, it often becomes more efficient to select exercises that direct tension more precisely toward the intended muscle, such as the BRIG20 exercises. By doing so, the stimulus can be delivered with less unnecessary fatigue affecting surrounding muscles and joints. In other words, the body is investing less energy while achieving a more focused stimulus and more effective training.

Another important consideration in training efficiency is how muscles are grouped within a workout. Many traditional workout programs organize exercises according to broad movement patterns such as push and pull. For example, chest, shoulders, and triceps are often trained together because they all contribute to pushing movements, while the back, rear deltoids, and biceps are grouped together because they assist in pulling movements. While this approach may appear logical from a movement perspective, it can also lead to inefficient fatigue distribution.

Consider the example of training the back and biceps together. During many back exercises, the biceps are already heavily involved as assisting muscles. By the time direct biceps exercises are performed later in the workout, the biceps may already be fatigued. This means they are no longer able to produce their maximum force or receive their most effective stimulus. In effect, the biceps are being trained when they are already partially exhausted, which may reduce the quality of the stimulus they receive.

An alternative approach is to train opposing muscle groups together, such as biceps and triceps within the same workout. When one muscle group is working, the opposing muscle group is resting. This allows each muscle to be trained while it is relatively fresh, improving the quality of the stimulus delivered during each set. In addition, both muscles operate through the same primary joint, the elbow. By alternating between these opposing muscles, the workload on the joint can be distributed more efficiently, which may support better recovery for both the muscles and the connective structures surrounding the joint.

This approach also reduces unnecessary fatigue from surrounding muscles. Instead of recruiting large numbers of stabilizing muscles across the entire body, the exercises can focus more directly on the target muscles themselves. The result is a training session that delivers meaningful muscular stimulation while minimizing excessive systemic fatigue.

When exercises are selected with this level of precision, the training process becomes far more efficient. Effort is still essential for muscle growth, but the goal is to direct that effort toward the muscles we intend to develop rather than dispersing it across multiple muscles and joints unnecessarily. This allows training to remain productive while making recovery more manageable from session to session.

This principle reflects a central idea within the SmartTraining365 approach: efficiency matters. When an exercise allows a muscle to receive high-quality tension with minimal unnecessary involvement from surrounding muscles, the stimulus-to-fatigue ratio improves. In practical terms, the muscle receives the signal it needs to grow while the body preserves energy and manages recovery more effectively over time. This efficiency allows training to be performed more consistently and with better long-term results.

Ultimately, the goal of hypertrophy training is not to accumulate the greatest possible amount of fatigue, but to deliver the most effective stimulus with the least unnecessary cost. When this balance between stimulus and fatigue is managed intelligently, workouts become more sustainable and long-term progress becomes easier to maintain.

Written By Moe Larbi
 Founder of SmartTraining365 & Ratel Mentality
Sports Performance Coach
 Helping athletes and everyday lifters train smarter, safer, faster, and stronger under real-world conditions.