There are generally two schools of thought as to how fast you should lift weights:
You should lift weights slowly.
You should lift weights quickly.
Who’s right?
Well, not many studies have tried to answer this question, which is why we jumped at the chance to help support emerging research on the topic.
Specifically, last year we donated several bottles of our best-selling 100% natural pre-workout supplement, Pulse, to a team of scientists based at the University of Tampa who were conducting a study on the ideal weightlifting tempo for muscle gain (including Chris Barakat, a member of Legion’s Scientific Review Board).
So far, studies have gone back and forth on whether you should use a slow or fast weightlifting tempo, with most showing small differences in tempo don’t seem to matter much one way or another. For example, severalmeta-analyses have found that a slow weightlifting tempo (> 2 seconds) was equally effective for gaining strength and muscle as a fast weightlifting tempo (<1 second).
In these studies, though, weightlifting tempo was usually measured as the total length of time it took to complete a single rep. That is, if the concentric (raising) portion of the rep took 1 second, the eccentric (lowering) portion of the rep took 2 seconds, and there was a 1-second pause in between, the entire rep would have a tempo of 4 seconds.
Some research had found that the eccentric portion of a rep seems to be responsible for much of the muscle-building benefits, which led the authors of this study to hypothesize that increasing the eccentric portion of the rep (and not just the length of the entire rep) might boost muscle gain.
In this study, the researchers had 18 men aged 18 to 35 train one leg with a fast weightlifting tempo, and the other leg with a slow weightlifting tempo.
Here’s how Chris Barakat explains the rationale for this study design: “. . . we utilized a ‘within-subject’ design to minimize confounding variables (e.g. dietary protein/calorie intake, sleep, genetics, etc.) between individuals . . . if you did SLOW tempo on both legs, and I used FAST tempo on my legs, and you outgrew me, it may have been due to the tempo, but also could be due to your genetics, nutrition, sleep, etc.”
Specifically, the fast weightlifting tempo involved doing leg extensions with a tempo of 1-0-1-0 (1-second concentric, no pause, 1-second eccentric, no pause). The slow weightlifting tempo involved doing leg extensions with a tempo of 1-0-3-0 (identical to the first group except with a 3-second eccentric).
The researchers also randomized which tempo the participants used with which leg. That is, some people trained their right legs with a fast tempo and their left legs with a slow tempo and vice versa.
All of the men had at least three years of weightlifting experience, and could barbell back squat at least 1.5 times their body weight (pretty stronk!).
They trained twice per week for eight weeks, and the researchers measured their thigh muscle thickness and leg extension one-rep max before and after the study. Before each workout, the subjects also drank a serving of Legion Pulse to ensure they were fully prepared for their training.
After collecting and analyzing all of the data, the researchers found that both groups gained about the same amount of strength and muscle overall, but that the fast weightlifting tempo group gained slightly more muscle in the lower portion of their thighs.
This flies in the face of the commonly held belief that slower weightlifting tempos, especially slower eccentric weightlifting, is better for muscle growth, and adds to the body of evidence showing that you’ll likely make equal or faster progress by lifting weights with a fast tempo (while maintaining good form).
Congrats to the team for conducting this study so we can make the most out of our time in the gym!
If this piqued your interest, check out the other research we’ve funded on nutrition, exercise, and supplementation to help advance our collective understanding of how to live fitter, healthier lives.
Mike Matthews is the founder of Legion as well as the author of several award-winning fitness books, including Bigger Leaner Stronger, Muscle for Life, and The Shredded Chef.
His simple and science-based approach to building muscle, losing fat, and getting healthy has sold over a million books and helped thousands of people build their best bodies ever, and his work has been featured in many popular outlets including Esquire, Men’s Health, Elle, Women’s Health, Muscle & Strength, and more, as well as on FOX and ABC.
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We just . . . wait for it . . . give you your money back. Holy moo cows. And that means you can say "yes" now and decide later.
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Many companies use shipping and handling fees to increase their profit margins, but here at Legion, we hate profits, so our shipping is free!
Okay, so we do dig on profits, but we also go in for happy customers, and free shipping works like gangbusters. So, if you live in the United States, your order ships free regardless of order size, if you live in the UK or Canada, your order ships free when it’s over $99, and if you live elsewhere, your order ships free when it’s over $199.
Also, if you don’t absolutely love our stuff for whatever reason, we don’t request you deliver it to a PO box in the Gobi Desert by carrier pigeon.
We just . . . wait for it . . . give you your money back. No returns. No forms. No nonsense. Holy moo cows.
That means you can say “yes” now and decide later. You really have nothing to lose.
Free Worldwide Shipping & Returns
Many companies use shipping and handling fees to increase their profit margins, but here at Legion, we hate profits, so our shipping is free!
Okay, so we do dig on profits, but we also go in for happy customers, and free shipping works like gangbusters. So, if you live in the UK or Canada, your order ships free when it’s over $99.
Why the restriction on international orders? Unfortunately, shipping abroad is very expensive, and if we didn’t require a minimum order size, we’d lose a lot of money. But! We're also hustling to improve our international logistics and will be passing our savings along to our international customers.
Also, if you don’t absolutely love our stuff for whatever reason, we don’t request you deliver it to a PO box in the Gobi Desert by carrier pigeon.
We just . . . wait for it . . . give you your money back. No returns. No forms. No nonsense. Holy moo cows.
That means you can say “yes” now and decide later. You really have nothing to lose.
Free Worldwide Shipping & Returns
Many companies use shipping and handling fees to increase their profit margins, but here at Legion, we hate profits, so our shipping is free!
Okay, so we do dig on profits, but we also go in for happy customers, and free shipping works like gangbusters. So, if you’re outside the USA, your order ships free when it’s over $199.
Why the restriction on international orders? Unfortunately, shipping abroad is very expensive, and if we didn’t require a minimum order size, we’d lose a lot of money. But! We're also hustling to improve our international logistics and will be passing our savings along to our international customers.
Also, if you don’t absolutely love our stuff for whatever reason, we don’t request you deliver it to a PO box in the Gobi Desert by carrier pigeon.
We just . . . wait for it . . . give you your money back. No returns. No forms. No nonsense. Holy moo cows.
That means you can say “yes” now and decide later. You really have nothing to lose.
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Many ingredients in supplements don’t have any scientifically validated benefits, and many ingredients that do are often underdosed to the point of irrelevance.
That’s why we only use the choice ingredients and precise doses shown to be effective in peer-reviewed scientific studies.
Clinically Effective Doses
You need more than great ingredients to make great products—you also need proper doses. That’s why we use the precise doses of ingredients shown to be effective in peer-reviewed scientific studies.
100% Natural Ingredients
“Natural” doesn’t always mean “better,” but in many cases, natural ingredients are superior to artificial ones for various reasons, including purity, safety, and efficacy.
That’s why all of our ingredients in all of our products come from plant and animal sources, including sweeteners, colors, and flavors.
Made in USA
If you want to ensure the supplements you’re swallowing every day are safe and effective, you want products produced in the USA.
That’s why all of our supplements are made in America in NSF-certified and FDA-inspected facilities that operate in accordance with the Current Good Manufacturing Practice (cGMP) regulations.
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Did you know that supplements can contain dangerously high levels of toxins like lead, arsenic, and cadmium?
That’s why we test every ingredient of every supplement we produce for heavy metals, microbes, allergens, and other contaminants and ensure they meet the strict purity standards set by the FDA.
Naturally Sweetened & Flavored
While artificial sweeteners may not be as dangerous as some people claim, studies suggest that regular consumption of these chemicals may indeed be harmful to our health.
That’s why all of our supplements are naturally sweetened and flavored and contain no artificial food dyes, fillers, or other unnecessary junk.
Science-Backed Ingredients
Many ingredients in supplements don’t have any scientifically validated benefits. That’s why we only use choice ingredients shown to be effective in peer-reviewed scientific studies.
No Chemical Junk
“Natural” doesn’t always mean “better,” but in many cases, natural ingredients are superior to artificial ones for various reasons, including purity, safety, and efficacy.
That’s why all of our ingredients in all of our products come from plant and animal sources, including sweeteners, colors, and flavors.
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In consideration of the services and/or products offered by Legion Athletics, Inc. (“Legion”) including, but not limited to, nutrition plans, exercise routines and coaching, and in addition to the payment of any fee or charge:
I knowingly and voluntarily enter into this waiver and release of liability and hereby waive any and all rights, claims or causes of action of any kind whatsoever arising out of my use of Legion’s services and/or products, and I hereby release and hold harmless Legion and its consultants, officers, contractors, agents, owners and employees from any and all responsibility, liability, cost and expenses, including for injuries, damages or disorders (physical, metabolic, or otherwise), resulting from my use of Legion’s services and/or products.
I understand that fitness activities including, but not limited to, strength, flexibility, and cardiovascular exercise, with or without the use of equipment, are potentially hazardous activities that involve a risk of injury and even death, and I am voluntarily participating in these activities and using equipment and machinery with knowledge of the risks involved. I hereby agree to assume and accept any and all risks of injury or death related to said fitness activities.
I understand Legion’s services and products are not meant to treat or manage any health conditions or circumstances, and I acknowledge that Legion has recommended I obtain a healthcare provider’s approval for my use of Legion’s services and/or products, through regular physical examination(s) and/or consultation. I acknowledge that I have obtained my healthcare provider’s approval or have decided to use Legion’s services and/or products without such approval and hereby assume all responsibility for my use of said services and/or products.
I understand that results from using Legion’s products and/or services are not guaranteed, and I agree to not hold Legion liable for any outcomes or lack thereof.
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This is the content
Some popular pre-workouts are all-natural. Some contain the right mix of high-quality ingredients. Some provide clinically effective doses. But only Pulse checks each of these boxes.
Pulse doesn’t just “contain natural ingredients''—every ingredient is naturally sourced from plants and animals. Pulse contains no artificial or synthetic substances of any kind.
Every serving of Pulse contains 15.1 grams of active ingredients that have been shown to be safe and effective in peer-reviewed scientific research.
Every active ingredient in Pulse is backed by published scientific studies that show benefits in healthy humans.
Pulse contains no harsh stimulants that wind you up and burn you out. Instead, it contains a 1:1 ratio of caffeine and L-theanine, which produces a smooth energy rush and comfortable comedown.
We carefully examined 508 pages of scientific research to find out exactly what should and shouldn’t be in a pre-workout drink.
Every bottle of Pulse is guaranteed to provide exactly what the label claims and nothing else—no heavy metals, microbes, allergens, or other contaminants.
While these types of chemicals may not be as dangerous as some people claim, studies suggest that regular consumption of them may indeed be harmful to our health. And that’s why we don’t put any of them into our products.
Before you buy a sports supplement, you should know that it's clean, safe, and transparent. And that's exactly what Labdoor's third-party testing and certification means.
It's hard to know for sure, but this probably makes Pulse the most-popular all-natural pre-workout supplement in the world.
If you don’t absolutely love this product, just let us know, and we’ll give you a full refund on the spot. No forms or return necessary.
Analyzed for purity and potency in a state-of-the-art ISO 17025 accredited lab by Labdoor™, the gold standard of third-party lab testing.
Analyzed for purity and potency in a state-of-the-art ISO 17025 accredited lab, the gold standard of third-party lab testing.
This product doesn’t just “contain natural ingredients’’—every ingredient is naturally sourced from plants and animals. This product contains no artificial or synthetic substances of any kind.
Fact Checked
Our scientific review board of nutritionists, dietitians, molecular biologists, doctors, and other accredited experts is responsible for reviewing every article, podcast, and video we produce to ensure they’re evidence based, accurate, trustworthy, and current.
Thanks to their connections, credentials, and academic experience, this team of MDs, PhDs, and other professionals has access to a wealth of research published in the largest and most prestigious journals in the world.
This allows them to not only review individual studies but also analyze the overall weight of the evidence on any and all topics related to diet, exercise, supplementation, and more.
If you feel that any of our content is inaccurate, misleading, out-of-date, or anything less than factual, please let us know in the comments section of the article in question.
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We follow a detailed, rigorous, multi-step process to create content that meets the highest standards of clarity, practicality, and scientific integrity.
First, our research associates provide our editorial team with accurate, up-to-date, proven scientific evidence.
Then, our editorial team uses this research to draft articles and outlines for podcasts and videos.
Finally, our scientific review board reviews the content to ensure all key information and claims are backed by high-quality scientific research and explained simply and precisely.
If you feel that any of our content is inaccurate, misleading, out-of-date, or anything less than factual, please let us know in the comments section of the article in question.