Cannabis Use Linked to Preference for Lighter Exercise

A new study out of the University of Alabama at Birmingham adds to a growing body of evidence against the couch-locked stoner image — though what it actually shows is more nuanced than a simple story about lazy or active cannabis users.

The research, presented as a poster at UAB’s 2026 Spring Expo, examined cannabis use and physical activity through a cross-sectional survey design. The central finding wasn’t that cannabis users exercise more or less overall — it’s that they appear to exercise differently. Participants who reported non-medical cannabis use tended to favor light to moderate activity, like walking and recreational sports, over vigorous workouts like heavy aerobics or high-intensity training. Cannabis may influence “the subjective experience of exercise, such as enjoyment or discomfort, rather than directly enhancing physical performance,” the authors concluded.

A methodological note first: the UAB work is an undergraduate poster presentation, not a peer-reviewed journal publication. The authors — Nitya Chiru, Brionna L. Smith, Karen L. Cropsey, and Elizabeth K. Lee, working under the university’s Heersink School of Medicine — haven’t completed the peer-review process, and the findings should be read as preliminary. What makes them worth reporting is how closely they track patterns already established in the peer-reviewed record.

What the Data Showed

The cross-sectional survey design captures associations at one point in time, can’t establish causation, and relies on self-reported cannabis use and activity levels. With those limits in mind, the researchers found no clear overall correlation between cannabis use and total physical activity — users weren’t more sedentary, but they weren’t putting in more vigorous training either.

The signal was in intensity preference. Among non-medical users, walking and recreational sports appeared more frequently than vigorous exercise categories. The authors attribute this to the endocannabinoid system’s known role in regulating mood, motivation, and motor function — suggesting that cannabis may reshape the experience of movement rather than its raw volume.

The team was direct about the study’s limits: “Future research should incorporate objective measures, such as wearable activity trackers, and use longitudinal or experimental designs to better understand causal relationships and the effects of different patterns of cannabis use.”

The Biology Behind the Pattern

The endocannabinoid system (ECS) provides a plausible mechanism. A 2023 review in the International Journal of Molecular Sciences by Matei and colleagues details how endocannabinoid concentrations — particularly the lipid messenger anandamide — rise in response to moderate-intensity aerobic exercise. CB1 receptor activation modulates mood, pain perception, and motivation through circuits involving the limbic system and basal ganglia. The ECS is also the primary driver of what we call the runner’s high — a phenomenon now attributed more to endocannabinoid signaling than to endorphins, which are too large to cross the blood-brain barrier efficiently. Our piece on the endocannabinoid basis of the runner’s high covers that evidence in depth.

If exogenous cannabinoids — THC in particular — interact with CB1 receptors before or during exercise, they could plausibly alter how exercise feels without changing how much of it someone does. That’s the mechanism the UAB findings are gesturing at: enjoyment amplified, discomfort reduced, which may favor activities that feel pleasant at a moderate pace over sessions that push into aerobic intensity territory. CBD’s documented effects on recovery and inflammation add another dimension — post-workout CBD use has attracted its own research interest, though the evidence base there is distinct from THC-and-exercise studies.

How This Fits the Broader Literature

The UAB poster sits within a larger peer-reviewed record that has reached largely consistent, if hedged, conclusions.

A 2024 population-based study published in the Journal of Cannabis Research by Merrill and colleagues analyzed Behavioral Risk Factor Surveillance System data from roughly 685,000 U.S. adults across 2016–2022. After adjusting for age, sex, BMI, smoking status, and chronic health conditions, cannabis users had significantly higher odds of being physically active (adjusted OR 1.24, 95% CI 1.10–1.41). The association was strongest in states where recreational cannabis was legal. Importantly, cannabis use for recreational purposes was significantly associated with physical activity; use for medical reasons alone was not — suggesting experiential and motivational factors matter more than pain management.

A separate accelerometer-based analysis using National Health and Nutrition Examination Survey data found that recent cannabis use was associated with a 4% increase in daily light physical activity, consistent with the UAB poster’s pattern and notable because it relied on objective movement tracking rather than self-report.

None of this settles causation. The variability across populations is real, and the field’s inconsistent findings may partly reflect differences in what kinds of physical activity researchers measured, how cannabis use was defined, and what populations were studied. What the UAB team’s work adds — even at a preliminary level — is a focus on intensity preference as a potentially distinct outcome, one that prior studies using binary active/inactive measures would have missed.

The next round of research the UAB team called for — wearable trackers, longitudinal designs, granular data on use frequency and consumption method — would let researchers separate cannabis effects on exercise motivation from effects on intensity choice. Those distinctions matter if the goal is to understand whether the endocannabinoid system can be a lever for exercise adherence in specific populations, rather than simply noting that cannabis users and exercise tend to co-occur.

References:

^{1. Chiru, Nitya; Smith, Brionna L.; Cropsey, Karen L.; and Lee, Elizabeth K., “The Effects of Cannabis Use on Physical Activity” (2026). Expo Student Presentations. 179. https://digitalcommons.library.uab.edu/sp-expo/179}