Your Muscle Pharmacy: The Right Activity = The Best Mood!
Reviewed by Dr. Scott Rollo, PhD and Dr. Peter Rawlek, MD
Let me start here. Walking, staying active, trying to do the right things, you may not have felt the emotional boost you expected. This matters. First, it is not about you, recent published research [1,2] has the exact answer.
What you’re doing may simply not be fully activating the system [2,3,4] (muscle system) to fully do the job it is capable of that drives meaningful mood change. Most people group all movements together (I did). We say “I’m active” and assume the body responds the same way across the board. It doesn’t. Your physiology is far more specific than that, especially when it comes to the brain. There are particular pathways that regulate mood, and they are not fully activated by all forms of movement.
Greater load = Stronger signal = Greater brain response [1,2]
Your muscles are not just there to move your body. They are active, responsive, chemical factories. Better put, they are the Muscle Pharmacy for among other things, low mood. When they are placed under real demand, not just motion but challenged, they release a cascade of signaling molecules into the bloodstream. These are called myokines, and they function like messengers, carrying information from your muscles to other parts of your body.
Some of those signals go directly to your brain
The myokines cross the blood brain barrier and interact with areas that are central to how you feel, think, and function day to day. The hippocampus, which is involved in memory and emotional regulation, is one of those areas. This region is known to be affected in people struggling with low mood. These signals also influence systems tied to serotonin and dopamine, the chemistry behind motivation, reward, and emotional balance. At the same time, they stimulate factors like BDNF, which supports brain growth, repair, and resilience.
This is not abstract. This is your biology responding to stimulus.
Now, where does walking fit in? [3]
Walking is valuable. It supports circulation, general health, and consistency. It washes out the brain residue accumulated during the day. It keeps you from being sedentary, which matters. But from a signaling standpoint, it is a lower load input. It produces a signal, just not a strong one. For many people, that signal is not sufficient to fully activate the pathways responsible for shifting mood in a noticeable and sustained way.
That’s often where the disconnect happens. People are doing something good, but not something strong enough to move the system.
Resistance training: a stronger biological signal [3,4]
When you challenge muscle, the entire response changes. More muscle fibers are recruited. Larger muscle groups engage. The demand placed on the system increases, and as a result, the chemical response is amplified.
That amplification matters. It creates stronger signaling to the brain, more significant neurochemical shifts, and more noticeable changes in mood and energy. The body is essentially saying, “This matters. Adapt.”
This is why the research is so consistent in this space. Resistance training has been shown to reduce depressive symptoms, improve anxiety, and enhance overall well-being. Not as a replacement for other care, but as a powerful biological partner that works alongside it.
So if you’ve been doing what feels like everything right and still feel off, this may be the missing piece. It’s not about doing more. It’s about doing what your system actually responds to.
The practical framework (ABC’s in reverse)
To access this system, keep it simple and repeatable.
D – Duration
This is not a one week shift. Commit to at least 4-8 weeks. The brain and body adapt over time, not overnight. (Minimum: 12 minutes daily)
C – Challenge
There has to be demand on the muscle. Resistance, compound movements, something that requires effort. Without challenge, the signal stays weak.
B – Big muscles
Focus on the larger muscle groups, legs, hips, back. These drive the most meaningful systemic response.
A – Adaptation (recovery)
Rest is not optional. It is where the system actually changes. Without recovery, there is no adaptation.
The key message here is simple.
Your brain does not just need movement. It needs the right signal. And that signal starts in your muscles.
Research:
Safaeipour C, Sherzai D, Zikria B. Exercise and Brain Health: Expert Review. Am J Lifestyle Med. 2026 Jan 9:15598276251415530. doi: 10.1177/15598276251415530. Epub ahead of print. PMID: 41523152; PMCID: PMC12788999.
These signals support dopamine, serotonin, and neuroplasticity pathways central to mood regulation
Wilfredo López-Ojeda, Ph.D., M.S., and Robin A. Hurley, M.D., F.A.N.P.A. Myokines and the Brain: A Novel Neuromuscular Endocrine Loop.The Journal of Neuropsychiatry and Clinical Neurosciences. 2025 Jan; 37(1): https://doi.org/10.1176/appi.neuropsych.20240173
Higher-intensity or load-based exercise produces greater increases in neurotrophic factors like BDNF, IGF-1, and VEGF, which drive neuroplasticity and hippocampal function.Zhou S, Xu Y, Yang Y, Song H, Wang X, Yu Y. Effect of exercise interventions on depression, anxiety, and self-esteem in children and adolescents: a systematic review and network meta-analysis. BMC Public Health. 2025 Oct 31;25(1):3706. doi: 10.1186/s12889-025-25044-6. PMID: 41174613; PMCID: PMC12577281.
A 2024–2025 network meta-analysis shows different exercise types produce different magnitudes of effect on depression, with resistance training ranking among the most effective
Setayesh S, Mohammad Rahimi GR. The impact of resistance training on brain-derived neurotrophic factor and depression among older adults aged 60 years or older: A systematic review and meta-analysis of randomized controlled trials. Geriatr Nurs. 2023 Nov-Dec;54:23-31. doi: 10.1016/j.gerinurse.2023.08.022. Epub 2023 Sep 11. PMID: 37703686.
Resistance training has been shown to significantly increase BDNF, a key molecule for brain adaptation and mood regulation.
