Every weekday, we help you make sense of the complex world of wellness by analyzing the headlines, simplifying the latest research, and providing quick tips designed to help you stay healthier in under 5 minutes. If you were forwarded this message, you can get the free daily email here.
Today’s Health Upgrade
Arnold’s corner: Monday motivation
How to spot a quality protein powder
Does the timing of your coffee matter after a bad night of sleep?
Workout of the week
Arnold’s Corner
Monday Motivation: The Hard Reps Make You Grow
This week, I want to focus on a problem I see in the gym all the time.
I’ve told you about how I feel when I see people doing half reps or cheating on their exercises.
This is different. These people are doing the full motion. 3 sets of 10 reps of a full stretch and a flex.
Their problem isn’t cheating themselves. It’s that their tenth rep looks just like their first rep. Easy.
And then, the next week they’ll come back and do the same 3 sets of 10 reps.
They’re going through the full motion, but that’s it: they’re just going through the motions.
Growth doesn’t come from easy reps. Your growth comes from the hard reps. The ones where you struggle. Sometimes, the ones where you fail.
I have told the story hundreds of times about when I asked Muhammad Ali how many sit-ups he does a day. He didn’t know, because he said, “I only count once they start hurting.”
We became friends immediately.
This is something I have preached for 6 decades, and finally, the scientists have caught up with me. Look at these three recent studies:
A study showed that mechanical tension is the primary driver of muscle growth. Not motion. Not sweat. Tension. If the reps are easy, the muscle has no reason to change. The muscle grows only when the load forces it to fight for every inch.
Researchers found that sets taken close to failure produced dramatically more growth than sets stopped early, even when total reps were the same. Translation: 10 easy reps do almost nothing, while 10 reps where the last 2–3 are brutal send the growth signal straight to the muscle, loud and clear. Same movement. Completely different result.
A study comparing “easy” training to hard training showed that muscles trained far from failure barely grew at all, while muscles pushed to near failure grew significantly, even with lighter weights. This proves it’s not about how much you lift. It’s about how hard the muscle has to work.
So don’t tell me you did 3 sets of 10. Tell me how many of those reps were hard.
Because muscles don’t grow from going through the motions. They grow from the reps that make you want to quit, and don’t. That’s not new. That’s just science finally catching up.
In the Pump Club app, the most popular article is called "First Set Mindset," which teaches people that a set isn’t over until you reach the hard reps.
That’s how I’ve trained my entire life. Whether my set is 15 reps or 2 reps, I am getting some reps where I have to force it, where the weight slows down, where you have to push with everything.
This week, we have a lot of new members who say they’ve trained for 3, 5, or 10 years, and when they did their first workout with my mindset, they felt it like they never had before.
What they are feeling is growth.
This is one of my lessons learned in the gym that also applies to life. You don’t get better at your job by cruising. You don’t become the best mom or dad by going through the motions.
You have to push through discomfort to grow at anything.
Growth starts where comfort ends.
I want all of you to grow.
So this week, we are making a simple adjustment to your training.
Every set, whether it is 5x5 or 3x10, I want you to pay attention, and I want you to count like Ali, once the reps are hard. Count to 2 or 3, and that set is over.
If you aren’t used to training this way, it will be an adjustment. You might go a few reps over the number you had listed in your workout to find the hard reps. You might fall a few short. You might even fail a rep.
That’s OK. As long as it is hard, you are growing. Take the information you learn and apply it to your next sets. If you fail early, the weight was too heavy. If you have to go 5 extra reps to find the hard reps, the weight was too light. That’s called using the gym as your lab. It isn’t called wasting sets, because any set that ends in hard reps is never wasted.
This week, we push out of the comfort zone into the growth zone.
Start now.
Together with Momentous
How To Spot a Quality Protein Powder (And Avoid a Common Mistake)
Protein powders are supposed to make it easier to hit your protein target. But some labels don’t tell the full story. And if you don’t know what to look for, you could be paying for protein that doesn’t actually help you build muscle.
Not all whey protein is equal, and some powders inflate their numbers in ways that reduce the amount of muscle-building protein you actually get.
Whey protein concentrate sounds like a premium ingredient. And sometimes it is. But that single phrase can hide a huge quality difference.
Whey protein concentrate can range from about 25% protein to over 80% protein by weight. That’s because lower-grade concentrates contain much more lactose and filler.
It’s not that all concentrates are bad. It’s that you don’t know what whey concentrate you get because supplement labels don’t have to disclose which grade they use. Two products can look identical on the front and be radically different on the inside.
You’ll still get the grams listed on the Nutrition Facts label. But you won’t know whether that protein came from a dense, high-quality source or a lower-grade powder padded with lactose.
And that’s not even the biggest issue. Some companies go a step further with a practice called protein (or amino) spiking.
Protein content is often measured indirectly by nitrogen levels. Cheap, free-form amino acids contain nitrogen, so manufacturers can add them to inflate the protein count without adding real, complete protein that your body can use.
Common spiking ingredients include glycine, taurine, and glutamine. These amino acids aren’t dangerous, but they don’t stimulate muscle protein synthesis the way complete protein does.
That means a scoop claiming 25 grams of protein may only deliver 15–18 grams of usable, muscle-building protein.
If you need help spotting a quality protein, here’s your cheat sheet:
Check the ingredient list. Be cautious if you see individual amino acids added to a protein powder.
Look for an amino acid profile on the label (good products have nothing to hide). For whey, leucine should be at least 10–11% of total protein, and total BCAAs should be at least 25%. If those numbers don’t line up, that’s a red flag.
Avoid proprietary blends. Transparency matters.
Do a reality check on price. High-quality whey costs more to make. If it seems too cheap, there’s usually a reason.
If you want to make it simple, select a whey protein isolate, which is standardized at ~90% protein with minimal lactose, so you don’t have to worry about the variation you get with concentrates. Only buy third-party certified products, such as NSF Certified for Sport or Informed Sport. And stick to brands that disclose protein grade and amino acid data.
That’s why Momentous is our protein of choice. They check all the boxes with transparency, quality, and effectiveness, all supported by the Momentous Standard. They emphasize what’s on the back of the label (the quality and ingredients) rather than what’s on the front (the marketing).
As an APC reader, you can get 30% OFF any Momentous subscription when you use the code “PUMPCLUB.”
Protein powder isn’t required to be healthy or strong. But if you use one, make sure it’s actually doing the job you hired it for. Read the label. Check the amino acids. And don’t settle for less.
Start Your Week Right
Drink Coffee After a Bad Night’s Sleep? Timing Might Matter More Than You Think
Most mornings, coffee feels like a lifeline. Especially after a rough night. But research suggests that when you drink it — relative to when you eat — might quietly shape how your body responds for the rest of the morning.
After a bad night’s sleep, drinking strong coffee before breakfast can spike your blood sugar far more than you’d expect, while eating first may be the smarter move.
Scientists tested three different morning scenarios: Normal sleep + no coffee, Fragmented sleep (waking every hour) + no coffee (you can consider this the nightmare scenario), and fragmented sleep + strong black coffee (~300 mg caffeine) before a carb-based drink.
The goal wasn’t to demonize coffee. It was to understand how sleep disruption and caffeine interact with blood sugar control.
Perhaps somewhat surprisingly, poor sleep alone didn’t impair blood sugar control the next morning. That’s good news if you have a newborn, are stressed, or had a restless night.
But when participants drank strong coffee before carbohydrates, their blood sugar response was about 50% higher than when they skipped coffee.
That’s not dangerous for healthy people. Blood sugar will vary. However, it can set you up for a sharper rise (and fall) in energy, which might explain your energy crash.
This might occur because caffeine temporarily reduces insulin sensitivity. In simple terms, it makes it harder for your muscles and liver to clear sugar from the bloodstream.
Combine that with fragmented sleep, which already nudges your stress hormones upward, and the effect gets amplified.
Food changes the equation. Protein, fat, and fiber slow the rate at which carbs enter your bloodstream, giving your body more time to manage the load.
So if you want more energy throughout the day after a night of poor sleep, you don’t need to avoid coffee. You just need to time it to be either with or after a meal.
That way, you’ll experience the same come-back-to-life caffeine boost but without the metabolic whiplash.
Fitness
Workout Of The Week
This week’s workout is a quick but intense circuit that is efficient and quietly demanding.
By pairing single-leg and single-arm movements, you’ll challenge strength, balance, and coordination without needing heavy weights or complicated setups. The lower-body work builds strong legs and hips, the upper-body moves reinforce pulling and pushing strength, and the core work ties everything together so nothing feels wasted.
How to do it
Perform the workout as a circuit, completing one set after another, resting as little as possible. Once you complete one set of each exercise in the order below, rest for three minutes. Then, repeat for a total of 3 to 5 rounds, depending on your experience.
Split squat (left leg forward): 8-10 reps
Single-arm row (right arm): 8-10 reps
Split squat (right leg forward): 8-10 reps
Single-arm row (left arm): 8-10 reps
Hamstring walkout: 10-15 reps
Pushup: as many reps as possible
Single-leg hip raise: 8-10 reps
Plank: 30 seconds
Give it a try, and start your week strong!
Better Today
Take any of these tips from today’s email and put them into action:
1. The Science Behind Hard Reps: Why Your Last 2-3 Reps Drive Most of Your Muscle Growth
Research confirms that mechanical tension — not movement or sweat — is the primary driver of muscle growth, and studies show sets taken close to failure produce dramatically more hypertrophy than sets stopped early, even when total reps are identical. The fix is simple: count like Muhammad Ali and only track your last 2-3 hard reps per set—the ones where you have to fight for every inch.
2. Protein Spiking Explained: Why a 25g Scoop May Only Deliver 15-18g of Muscle-Building Protein
Whey protein concentrate can range from 25% to over 80% protein by weight, and labels don't have to tell you which grade you're getting. To make it more complicated, some manufacturers use "protein spiking" with cheap amino acids like glycine and taurine to inflate nitrogen counts, meaning a 25-gram scoop may only deliver 15-18 grams of usable protein. To verify quality and ensure you’re taking a high-quality protein, check that leucine is at least 10-11% of total protein, total BCAAs hit 25% or higher, and look for third-party certifications like NSF Certified for Sport.
3. The Case for Eating Before Your Morning Coffee (Especially After a Rough Night)
A study testing three morning scenarios found that drinking strong black coffee (~300mg caffeine) before carbohydrates after poor sleep increased blood sugar response by approximately 50% compared to eating first. It’s likely because caffeine temporarily reduces insulin sensitivity, making it harder for muscles and the liver to clear glucose. The good news: poor sleep alone didn't impair blood sugar control, and eating protein, fat, or fiber before (or with) your coffee buffers the effect.
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Publisher: Arnold Schwarzenegger
Editors-in-chief: Adam Bornstein and Daniel Ketchell
