Maximize Your Fitness: Focus on Intensity and Volume Instead
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The Importance of Exercise Intensity and Volume
Navigating the maze of exercise recommendations can be overwhelming. As a physical therapist with a decade of experience, I've often found myself frustrated by the contradictory advice shared by various experts, including clinicians, trainers, and coaches.
Despite the fact that less than 25% of Americans meet the recommended physical activity levels, many face an onslaught of warnings about exercises to avoid. This often results in more barriers than solutions. For instance, while some claim that foundational exercises like squats and deadlifts are essential for overall health, others suggest they can lead to severe injuries, such as knee and back problems.
The debate doesn’t end there; similar controversies surround cardiovascular exercises. Articles and videos often assert that running is detrimental to knee health, while cycling may harm your back. So, what’s the truth? The type of exercise you select is less significant than how you approach it.
The Misconceptions Surrounding Exercise Safety
Fear-based narratives about exercise can be easily dismissed. Research, including systematic reviews published in the Journal of Orthopedic and Sports Physical Therapy, indicates that lifting heavy weights—even with a rounded back—is not inherently dangerous. In fact, the body is remarkably resilient and can adapt to various stresses. Activities such as running and jumping can even be beneficial, particularly for those with osteoarthritis.
When evaluating claims about the dangers of exercise, it’s essential to seek empirical evidence. Remember, all forms of exercise exert some force or pressure on the body; this is how adaptation occurs!
If your goal is to cultivate resilience and prepare for life’s physical challenges, engage in exercises that mimic those demands. For instance, consider incorporating trunk rotations, side lunges, and Jefferson curls—these exercises effectively prepare your body for diverse movements.
Focusing on the Right Factors
Many people waste time searching for the "perfect" exercise when they should prioritize intensity and volume. These two factors are critical for enhancing strength, speed, power, and endurance.
Systematic reviews and meta-analyses—studies that compile data from various trials—show that the type of exercise is secondary to the volume and intensity of your workouts. A systematic review of 15 studies in the journal Sports Medicine highlights that training close to muscle failure is crucial for promoting muscle growth.
For example, when performing squats, leg presses, or using a leg extension machine, the best results for quadriceps development occur when you are just one to three reps shy of failure. While squats are effective for muscle building, context matters. If you can squat 500 pounds, performing body-weight squats alone won’t significantly enhance your strength.
Understanding Volume and Intensity
When considering your fitness goals, the first step is determining what you want to achieve. If your aim is general health, aim for at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic exercise weekly, along with two sessions of resistance training. Moderate intensity can be gauged as a 4–6 out of 10 effort, while vigorous intensity is rated as 7+.
To stimulate adaptations—such as increased muscle mass or endurance—you must challenge yourself with sufficient intensity and volume. While you don’t need to train at maximum effort all the time, your workouts should be sufficiently demanding.
For resistance training, proximity to muscle failure is key. Muscle failure occurs when you can no longer perform an additional repetition. It’s important to note that muscle fatigue does not equate to failure; true failure is when you cannot perform another lift.
For cardiovascular workouts, limit high-intensity sessions to 20% or less of your total training volume. High-intensity interval training (HIIT) can enhance endurance but demands more recovery time. Interestingly, 60 minutes of moderate-intensity continuous training can yield similar results to just 20 minutes of HIIT, according to meta-analyses in reputable journals.
Increasing Exercise Volume
Volume refers to the total amount of work completed in a given exercise session. For example, if you run two miles at a 10-minute mile pace, your volume is either 20 minutes or two miles. However, if you increase your speed to a 7-minute mile pace for two and a half miles, while your run time decreases, your body experiences a different demand.
To continue improving fitness, you need to progressively increase either volume or intensity. Whether through additional high-intensity intervals or extending your training time, both methods can enhance overall volume.
For resistance training, you can boost your volume by either lifting heavier weights or performing more repetitions. If you’re training close to failure, consider adding more sets to increase total reps. However, be mindful that this will extend your time in the gym, so weigh the benefits against the time commitment.
Establishing the Right Exercises for You
Ultimately, the most critical question you should ask is: Which exercises will you commit to long-term? No matter how well-designed a fitness program might be, if you don’t enjoy it, you won’t stick with it.
There are numerous reasons you may avoid certain exercises. You might lack access to specific equipment or simply prefer not to join a gym. Fortunately, alternatives like bands and bodyweight exercises can lead to comparable strength and muscle growth outcomes, as evidenced by research in Sage Open Medicine and the Journal of Strength and Conditioning Research.
If you dislike running, don’t fret! Studies show you can achieve excellent fitness levels and endurance without ever hitting the pavement. Similarly, if heavy lifting doesn’t appeal to you, lighter weights can still yield impressive muscle growth, as demonstrated in research published in Sports Medicine Open.
Ultimately, no single exercise reigns supreme. If your aim is general fitness and well-being, choose activities you enjoy and can maintain consistently. Just ensure your workouts are aligned with the appropriate volume and intensity to achieve your goals.
In this video, discover how to select the best exercises tailored to your individual needs, ensuring that your workouts are both effective and enjoyable.
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