Try a different workout time
Researchers are advising people to match exercise to their body clock because the time of day can change how a workout feels and how likely someone is to stick with it, according to a BBC report (bbc.com). The piece suggests low motivation sometimes reflects bad timing rather than a bad plan, and recommends experimenting with morning versus evening sessions to find what feels sustainable (bbc.com).
Your workout may feel easier — and be easier to keep doing — if you move it to a different time of day that fits your body clock. (openheart.bmj.com) That body clock is called a chronotype: some people are naturally sharper early, while others peak later. A 2026 randomized trial in *Open Heart* tested whether matching exercise time to that preference changed results. (openheart.bmj.com) Researchers in Lahore, Pakistan, enrolled 150 sedentary adults ages 40 to 60 with at least one cardiovascular risk factor between January and June 2025. They sorted participants into morning-type or evening-type groups using a standard questionnaire and 48-hour temperature monitoring. (openheart.bmj.com) Participants then did supervised moderate-intensity aerobic exercise for 40 minutes, five times a week, for 12 weeks. Some trained at their preferred time, while others trained at their non-preferred time. (openheart.bmj.com) Of the 150 people randomized, 134 finished the study. The chronotype-matched group had bigger improvements in systolic blood pressure, heart-rate variability, peak oxygen uptake, low-density lipoprotein cholesterol, fasting glucose, and sleep-quality scores than the mismatched group. (openheart.bmj.com) The blood-pressure gap was concrete: systolic pressure fell by 10.8 millimeters of mercury in the matched group versus 5.5 in the mismatched group. The paper also reported better adherence when exercise time matched a participant’s chronotype. (openheart.bmj.com) Researchers have been studying this for years because exercise performance follows a daily rhythm tied to temperature, hormones, and alertness. A 2019 review in *Current Opinion in Physiology* said exercise outcomes can be modified by when activity is performed, and a 2025 explainer by *The Conversation* said many people are strongest between about 4 p.m. and 7 p.m. (pmc.ncbi.nlm.nih.gov) (theconversation.com) The advice is not that everyone should switch to dawn workouts. Experts quoted by the Science Media Centre said the new trial points to a personalized approach, not one universal best hour, and noted that even the misaligned group still improved. (sciencemediacentre.org) They also flagged limits: the study was moderate in size, lasted 12 weeks, and involved one at-risk population in Pakistan. The same experts said the findings need replication in larger and more diverse groups before they are treated as a broad rule. (sciencemediacentre.org) That caution matters because exercise timing research is mixed outside this trial. A 2023 American Diabetes Association commentary said morning-versus-evening findings vary by condition, and consistency may matter more than the clock for many people. (diabetesjournals.org) Public-health guidance has not changed: adults should still aim for at least 150 minutes of moderate activity a week and muscle-strengthening work on at least two days. The newer question is whether those minutes are easier to keep if they happen when your body is most ready for them. (heart.org)
