Each winter the resolutions that crowd the gym floors in January begin to fade, and Colorado researchers are asking a question that reaches beyond any single season: if movement lifts the mood, why do so many people find it so hard to keep moving? Roughly a third of Americans meet the federal activity guidelines, and in a state that prides itself on its outdoor life the figure is only slightly higher. The answer, as the experts see it, lies less in the body's chemistry than in the particular person, with their history, their temperament, and the circumstances in which they try to move.
Why Exercise Feels Good in Theory but Hard in Practice, According to CU Anschutz Researchers
Consistency is much more important than everything else.
Mark
The headline fact is that exercise helps mood, yet most people don't do enough of it. Why the gap?
Mimi
The researchers say the endorphin story is true but too tidy. Katrina Oselinsky notes the same person can feel a workout differently from day to day, depending on mood, life circumstances and setting.
Luke
And the benefit itself? The piece says studies disagree on how large it is.
Mimi
Right. The article calls the benefit clear but says the size is contested, so nobody is promising a specific payoff.
Mark
What about the runner's high?
Mimi
Emily Hemendinger says only a subset of people get it after intense exercise. Those who don't may feel let down. Reward sensitivity differs between brains, and past experience matters too.
Luke
Careful, though. That's her explanation. The article doesn't give data on how many people get a runner's high or how reward sensitivity predicts who sticks with exercise.
Mark
Fair. So what does Marcelo Bigliassi add?
Mimi
That exercise used to be built into life, through finding food or dancing. Now people need a reason. He stresses consistency over intensity and warns against picking something you dislike, overdoing it and feeling like a failure.
Luke
The 30% and 35% figures are stated without a source or year in the article, so treat them as reported, not verified here.
Mark
And the practical advice?
Mimi
Pick something enjoyable, pair it with music, a friend, a pet or the outdoors, and count everyday movement like gardening or chasing toddlers. Hemendinger's line: joyful movement is hard to find but important.
Luke
Still unanswered is whether this advice actually raises adherence. The article presents expert opinion, not trial results.
The Pulse
- Only about 30% of Americans and 35% of Coloradans meet federal activity guidelines, even as the mental health benefits of exercise remain well documented.
- January's packed gyms have thinned by February, and many resolutions are quietly collapsing under the weight of discomfort, boredom and self-judgment.
- Researchers at CU Anschutz and Florida International University are pushing back on the simple endorphin story, arguing that the same workout can feel joyful to one person and miserable to another.
- The path forward is taking shape: choose movement you actually enjoy, pair it with something pleasant, accept everyday activity as real exercise, and value showing up consistently over pushing hard.
Each winter the resolutions that crowd the gym floors in January begin to fade, and Colorado researchers are asking a question that reaches beyond any single season: if movement lifts the mood, why do so many people find it so hard to keep moving? Roughly a third of Americans meet the federal activity guidelines, and in a state that prides itself on its outdoor life the figure is only slightly higher. The answer, as the experts see it, lies less in the body's chemistry than in the particular person, with their history, their temperament, and the circumstances in which they try to move.
By February, the gym floors that were crowded in January have grown quiet, and the resolutions that filled them are losing their glow. Researchers in Colorado are asking why exercise, which so clearly lifts mood, is so hard for people to keep doing. Only about 30% of Americans meet federal activity guidelines, and in Colorado, a state built around the outdoors, the number is just 35%.
Clinicians at the University of Colorado's Anschutz Medical Campus say the endorphin explanation is true but incomplete. Brain chemistry, daily mood, life circumstances and setting all shape how a workout feels, so the same session can energize one person and drain another. Some people get a runner's high and many do not, and those who don't can end up discouraged. Reward sensitivity and past experience matter too, along with discomfort, fear of judgment, perfectionism, boredom and exhaustion.
A researcher at Florida International University notes that for most of human history, movement was woven into life through foraging, work and play like dancing. Today people must find a reason to exercise, and that reason is not always obvious. His advice is to choose something challenging enough to feel like an accomplishment but not so hard that it drives people away. Consistency, he argues, matters more than anything else, because the mental and cognitive benefits arrive only for those who stay with it.
The researchers also stress that belief in one's ability, support from others, and gradually growing skill make exercise more pleasant. Pairing movement with the outdoors, a friend, a pet, music or a podcast can make it easier to keep going. Movement does not have to happen in a gym either: physical work, carrying a tired toddler, or gardening all count. As one expert put it, joyful movement is hard to find, but it is important.
By February, the gym floors that were packed in January have thinned out, and the New Year's resolutions that filled them have lost their shine. The pattern is familiar enough that researchers in Colorado are asking a plain question: if exercise lifts mood, why do so many people struggle to keep doing it?
The numbers frame the puzzle. Only about 30% of people nationwide meet the federal guidelines for physical activity. In Colorado, a state known for its outdoor culture, the figure is just 35%. The mental health benefits of exercise are well established, though studies disagree about how large those benefits are.
Katrina Oselinsky, a post-doctoral researcher at the Health and Wellness Center on the University of Colorado's Anschutz Medical Campus, says the popular story about endorphins is not wrong but is too simple. Brain chemistry and mental state interact in complicated ways. The same person can experience the same workout differently from one day to the next, depending on mood, what else is going on in their life and where they are exercising. "The same workout can feel energizing for one person and uncomfortable for another," she said.
Emily Hemendinger, an assistant professor of psychiatry at CU Anschutz, points to the runner's high. Some people do get one after intense exercise, but not everyone does, and those who don't can end up disappointed. Brains also differ in how sensitive they are to rewards, so some people are primed to enjoy exercise more than others, though past experiences with exercise matter too. Exercise releases chemicals that give most people at least some pleasure, Hemendinger said, but not enough to drown out discomfort with one's body, fear of being judged, perfectionism, boredom, pain or exhaustion. "It's not like doing drugs, and what that lights up in our brain right away," she said.
Marcelo Bigliassi, an assistant professor at Florida International University, offers a historical angle. For most of human history, exercise was not a separate activity. People moved to find food or while doing something inherently rewarding, such as dancing. Now people have to find a motivation for it, and it is not always obvious. "We don't do anything without a reason," he said. The brain does release dopamine, which prompts the desire to repeat exercise, but it can also get "really creative" at finding ways to avoid discomfort. His advice is to find something challenging enough to give a sense of accomplishment but not so hard that people quit. He warned against picking something disliked, going at high intensity, getting injured and feeling like a failure.
Over time, Bigliassi said, the data is clear that exercise improves mental health and cognitive abilities such as problem-solving. Many people give up before those benefits arrive because they set themselves up to fail or are unprepared for setbacks. "Consistency is much more important than everything else," he said.
Oselinsky added that people who believe they can accomplish what they set out to do report more enjoyment than those who feel defeated from the start. Support from people around you improves the experience, and newcomers tend to feel better about exercise as they get better at it. Because people are not good at sticking with things they dislike, she suggests choosing an activity you enjoy or pairing exercise with something else you like: being outside, time with a friend or pet, music or podcasts. "If you're trying to force yourself to stick with something you don't like, it's going to be harder," she said.
Nor does it have to happen in a gym. Oselinsky said movement through the day can be as good as a dedicated session, whether that is physical labor at work, carrying toddlers who don't feel like walking, or gardening once spring arrives. Federal guidelines call for 150 minutes of moderate or 75 minutes of vigorous activity weekly, plus muscle-strengthening exercise on two days. Hemendinger said any movement someone enjoys, from a trampoline to playing with a dog, is a step in the right direction. "Joyful movement's hard to find, but it's important," she said.
Notable Quotes
While endorphins are part of the picture, there's a lot more going on.— Katrina Oselinsky, CU Anschutz post-doctoral researcher
Joyful movement's hard to find, but it's important.— Emily Hemendinger, CU Anschutz assistant professor of psychiatry
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