The Exercise Prescription: How Muscle Resets Your Biological Clock

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Okay, this week in Cell to Systems, we'll be covering exercise and why it's more than just looking good or losing weight. We want to look at how you can really break it down or build it up to realize that it may be one of the most important components of living a long and healthy life. We have a great team to talk about it from many different angles and it's an exciting episode. First, I'd like to throw it over to our powerlifter, Dr. Suzanne Ferree.

It's funny, I've been through a couple of iterations of activity in my life. When I was in my 20s and 30s, I was a competitive runner—not long distance like marathons, but certainly competitive. It was great for producing endurance and sustainability, and it taught me how to tolerate ongoing pain. Especially in races where you weren't allowed to wear headphones, you had to get into your brain to persist for a prolonged period. Eventually, my ability to do that waned due to an injury. I needed to move on to something else and started doing a Tabata-style exercise weight training class.

That progressed because of my competitive nature and love for hitting PRs. Powerlifting came into being, motivated by the goal of going into the gym every week and thinking, "I can do ten more pounds." My goal was always to get to a 600 lb total lift. Once I passed that, I felt I was done with it. Now my training is way different. Doing research on what’s best for my body at 53 years of age, I tried a yoga class and found it life-giving. However, yoga isn't going to maintain as much muscle mass as I would like, so I’m trying to mix it up.

My training course right now, which I think we talked about a couple of weeks ago, is to do a 10-day cycle instead of the typical 7-day cycle. While the muscle may take 24 to 48 hours to recover, the nervous system really takes longer than that. Especially for high achievers working hard and taking care of families and businesses, we need to consider this longer reset. For me, day one is usually Tabata-style or bodybuilding. Day two is a "Zone 2" day—battle ropes, a light jog, or jumping jacks to get good cardio. Day three is heavier weightlifting with shorter courses. Day four might be a rest day or another Zone 2 day.

This 10-day cycle doesn't really follow our typical American lifestyle, which is very Monday-through-Sunday oriented. It means you might work out on weekends or do different things every weekend, but your mind needs that variety. The nervous system needs a longer reset than just the two- or three-day cycle we've talked about in the past. For me, this feels like a great rhythm, and adding core strengthening with Pilates classes has also been really helpful.

That’s a comprehensive look at how you go about it. Since we talked about it a few weeks ago, I've thought a lot about how the central nervous system might be overtaxed even if the muscles feel ready. Christie, as a former collegiate athlete, you probably learned a lot about overtraining on the track or the trail.

Exactly. I’m so thankful there’s been a shift at the college, high school, and club levels. It’s not always about going 100% all the time. I look at it and talk to patients about it as a prescription. Frequency, intensity, and recovery matter; it shouldn't be random. We are testing a pilot where I work with a chiropractor, a physical therapist, and a nutritionist. Patients come in for labs and spend about six hours going through everything. Then we sit down as a team to come up with a prescription—not only for peptides and supplementation but also from a food and movement perspective.

Our exercise prescription is going to be totally different from someone who has neurovascular or cardiovascular disease. Dr. Hussein recently did a YouTube video showing the correlation between muscle, bone health, and heart health—how they are absolutely intertwined. Longevity is not built off of extremes; it’s built off of consistency. Muscle is such a great predictor of lifespan, even more so than some of the labs we look at.

When I first came into this world, what fascinated me was understanding what was happening on a cellular level during exercise. I realized that the cell signaling and mechanism of action of many peptides mimicked things that happened when you exercised. That was the "unlock" for me: what happens when we put these things together? Using the right peptides at the right time to converge on pathways alongside exercise yields the best outcomes I’ve ever seen. We use tools like DEXA scans or InBody for body composition, and metabolic breath analysis to measure how efficiently cells oxidize fat or carbohydrates.

We want to find the "biggest bang for your buck." If you only have two hours a week to exercise, we want to move the needle the most. Frank, from a supplementation standpoint, what helps people optimize their exercise? I’ve been thinking about "exercise mimetics"—what we used to call "exercise in a pill." It activates the same molecular pathways that physical exercise triggers without the actual mechanical load. The goal isn't to replace exercise, but to amplify it or help people who are unable to exercise get some benefits.

Creatine is number one on my list. It is probably the most evidence-backed compound in the conversation. It helps with ATP resynthesis for muscle contraction, but its function as an osmolyte is even more important because it counters sarcopenia and fat infiltration into the muscle. Creatine is not optional in a longevity protocol; it’s foundational.

Another compound inhibits an enzyme called NNMT. When NNMT is overexpressed, it acts as a metabolic brake. Inhibiting it creates more NAD precursors, which leads to the activation of SIRT1—the longevity gene—and AMPK, the master metabolic switch. If you can protect and improve muscle mass with these tools, it’s a big win, especially for those who tend to overtrain.

Craig, you have a unique approach. I hate going to the gym. I like to work out at home and do functional fitness. Whether that's water sports, paddling, or bodyweight exercises like pull-ups, squats, and lunges, my goal is to never be slower or weaker than I was the day before. I’m interested in the research on "exercise snacks." It found that if an individual engages in a minute or less of high-intensity strenuous exercise—like running up stairs or doing burpees—three to six times a day, it corresponds to changes in visceral fat and VO2 max comparable to someone on a treadmill for 40 minutes.

We also need to focus on protecting our bodies. Eccentric movement (lengthening the muscle) is really protective of tendons and builds injury resilience. Conversely, concentric contraction is what pushes out myokines. Myokines like irisin enhance mitochondrial biogenesis, and BDNF enhances mood and cognitive performance. If people understand these natural benefits, it helps motivate them.

For the average person, we need super practical prescriptions. For my patients who travel and only have a hotel room, I recommend "five 100s": 100 sit-ups, 100 push-ups, 100 dips on a chair, 100 squats, and 100 lunges. The goal is to eventually be able to do that in 15 minutes. It requires no equipment and can be modified based on ability or how well you slept.

The hardest thing is getting people to be consistent. I’ll take a "crappy" workout that is consistent over someone who kills themselves once every three months. I even tell some patients they aren't allowed to get certain peptides until they show me four weeks of consistency. We also have to train them mentally for plateaus. When the scale doesn't move, your biochemistry is still changing. Winning is when you keep going even when nothing seems to make sense.

We need to explain to people why muscle mass matters. It’s not just about looking good; it's about the fact that muscle is your largest "glucose sink." If you want to maintain insulin sensitivity and avoid frailty, you need skeletal muscle. We don't lose muscle because we age; we age because we lose muscle.

What scares me now is the prevalence of certain drugs. GLP-1s are all over the world, and they are probably the biggest contributors to muscle mass decrease I’ve ever seen. If you're on them, you have to be very careful to take creatine and maintain your protein intake. Similarly, prednisone is probably the most muscle-destructive commonly prescribed drug in existence. Statins can also play a role. We have to address the "muscle tax" these medications take on the body.

To wrap up, we need to avoid prolonged sedentary periods. You can't just go to the gym for an hour if you've been sitting for nine. Get up every hour and do some jumping jacks or push-ups. Exercise is top of mind for everyone, and looking at it holistically—with the right food, the right recovery, and the right prescription—is the future of medicine. We’ll see you next week on Cell to Systems.