When you walk into the gym, do you need to do "half an exercise or a million infinity exercises" to get jacked? The answer, predictably, is somewhere in between. But most people err on the side of doing way too many, creating cluttered workouts that kill intensity and waste time.
Dr. Mike Israetel breaks down a systematic approach to exercise selection. Instead of a one-size-fits-all number, he offers a logic-based framework to help you decide exactly how many movements you need to maximize muscle growth without burning out.
TL;DR: Key Takeaways
- Volume is King: Muscle growth is stimulated by the number of hard sets you do, not the number of different exercises you perform.
- The "Staleness" Limit: After about 5-7 sets of a single movement, performance and connection tend to drop, signaling it might be time to switch exercises.
- Avoid Junk Volume: Doing more than 10-12 sets per muscle in a single session usually leads to diminishing returns and "junk volume".
- Frequency Matters: If you train a muscle 3+ times a week, you only need 1 exercise per session. If you train it once a week, you might need 2-3.
- Don't Be Redundant: Doing four types of rows in one workout isn't variety; it's redundancy. Pick exercises that actually hit different functions or angles.
The Cup Analogy: Sets vs. Exercises
Before counting exercises, you must understand how muscle grows. Dr. Mike compares muscle stimulation to filling a cup with water. The "water" is the number of hard working sets. As long as you fill the cup with enough sets, the muscle will grow.
The number of exercises is simply a tool to help you get those sets in. If you can fill the cup with just one exercise, great. If you need three exercises to get the same volume without your joints hurting or your mind wandering, that is also valid. But the exercise count itself is not the driver of growth.
The 5 Constraints: When to Add Variety
If sets are what matter, why not just do 20 sets of squats? Dr. Mike outlines five constraints that dictate when you should add a second or third exercise:
- Staleness: For most people, doing more than 5-7 sets of the same movement leads to psychological boredom, joint discomfort, or a loss of mind-muscle connection. Switching exercises re-engages the brain and body.
- Functional Parts: Some muscles have distinct heads that do opposite things (e.g., front vs. rear delts). You often need different exercises to hit all functional parts of a complex muscle group.
- Junk Volume: After 10-12 hard sets in a session, your ability to generate tension drops. Adding more exercises at this point is like the last 30 minutes of a movie you stopped caring about—you are just going through the motions.
- Logistical Cost: Every time you switch exercises, you lose time setting up, waiting for machines, and warming up. Staying on one machine saves time and keeps you in the "groove".
- The "Groove" Factor: Often, your best sets are your later ones (sets 3 or 4) because you have dialed in your technique. Switching exercises just as you get comfortable is counterproductive.
The Magic Numbers: How Many Exercises Do You Need?
Based on those constraints, here is the concrete recommendation depending on your training split:
High Frequency (Training a muscle 3+ times per week)
Recommendation: 1 Exercise per session.
If you train biceps Monday, Wednesday, and Friday, you can simply do one type of curl each day. This allows you to get 5-7 high-quality sets per session without needing to set up multiple stations.
Moderate/Low Frequency (Training a muscle 1-2 times per week)
Recommendation: 2-3 Exercises per session.
If you only train back once a week, you have a lot of volume to cram in (likely 10+ sets). Doing all of that on one movement would be boring and painful. Splitting that volume across 2 or 3 exercises ensures you hit different angles and stay fresh.
The "Danger Zone" (4+ Exercises)
Recommendation: Avoid.
Doing four or more exercises for a single muscle group in one workout is rarely worth the time. It causes "variation burn," meaning you use up all your good exercises in one session, leaving nothing novel for future mesocycles.
Common Mistakes to Avoid
1. Exercise Redundancy
Doing a bent-over row, a dumbbell row, a machine row, and a cable row in the same workout is redundant. You are just doing the same movement pattern four times. Instead, pick one row, one vertical pull, and maybe a pullover. Check different boxes rather than checking the same box four times.
2. The "Freshman" Chest Workout
Many lifters try to hit every angle in one day: flat bench, incline, decline, dips, crossovers, and pec deck. This is unnecessary. You don't need to stimulate every single fiber in every single session. You can hit the upper chest on Monday and the lower chest on Thursday. As long as you hit all components throughout the week, you will grow.
3. Confusing Plates with Food
Dr. Mike uses a kitchen analogy: Muscle growth comes from the amount of "food" (sets) you eat, not the number of "plates" (exercises) you use. If you use ten tiny plates, you just have more dishes to wash. If you use one big plate, you get the same nutrition with less hassle.
Final Thoughts
There is nothing magical about doing more exercises. As long as you perform high-quality sets with good technique and high intensity, the number of exercises should be kept as low as possible to meet your volume needs. For most people, that means 1-3 exercises per muscle group, per session. Keep it simple, train hard, and don't worry about making your workout look cool for Instagram.
Frequently Asked Questions
How many exercises should I do per muscle group?
It depends on your frequency. If you train a muscle 3+ times a week, do 1 exercise per session. If you train it 1-2 times a week, do 2-3 exercises. Doing more than 4 is almost never necessary.
What is "junk volume"?
Junk volume refers to sets performed when you are already too fatigued to generate a meaningful stimulus. This typically happens after you have already done 10-12 hard sets for a muscle group in a single session.
Is it okay to do just one exercise for a muscle?
Yes, especially if you train that muscle frequently. If you can get 5-7 high-quality sets from one exercise without joint pain or boredom, that is often better than switching movements and wasting time on setup.
Why shouldn't I do 5 exercises for my back?
Doing 5 exercises burns through "variation." If you use every back machine in your gym in one workout, you have no new exercises to switch to when you get stale in a few months. It also likely leads to redundancy, where you are doing multiple exercises that serve the exact same purpose.
