Timing may fix workout slumps
Researchers are advising that workout adherence often depends on your body clock, and that changing the time of day you exercise can improve consistency when routines feel unusually hard to stick with. (bbc.com) Practical reporting recommends matching training to when you have the most energy—rather than relying only on motivation—to make sessions less of a struggle. (bbc.com)
Your body clock may be one reason workouts suddenly feel harder to keep up with, and changing the hour you train can help. (openheart.bmj.com) A randomized trial published April 14, 2026 in *Open Heart* assigned 150 sedentary adults in Lahore, Pakistan, ages 40 to 60, to exercise either at their preferred time of day or at a non-preferred time. Researchers sorted them as morning or evening types with a Morningness-Eveningness Questionnaire and 48-hour temperature monitoring. (openheart.bmj.com) Both groups did the same supervised aerobic program for 12 weeks: five sessions a week, 40 minutes a session. Of the 150 participants, 134 finished, and the chronotype-aligned group posted larger gains in blood pressure, heart rate variability, peak oxygen uptake, low-density lipoprotein cholesterol, fasting glucose and sleep quality. (openheart.bmj.com) The biggest practical point was not that morning always beat evening, or the reverse. Early chronotypes did better with morning sessions, while late chronotypes did better with evening sessions, the paper reported. (openheart.bmj.com) Chronotype is the body’s built-in preference for earlier or later sleep and activity, often described as being a morning person or a night owl. The researchers said exercise prescriptions usually specify frequency, intensity and duration, but rarely timing. (bmjgroup.com) That gap has been clear in the broader research for years. A 2023 systematic review in *Sports Medicine - Open* found little evidence for one universal best time of day to train, but some evidence that matching training and testing times can help performance-related outcomes. (link.springer.com) Outside this new trial, researchers have also linked timing and regularity of daily movement to fitness. A University of Florida Health study published in 2025 reported that about 800 older adults with earlier and more consistent activity patterns had better cardiorespiratory fitness and walking efficiency, though the authors said the study did not prove cause and effect. (ufhealth.org) Independent experts said the new trial is useful but limited. The Science Media Centre quoted King’s College London researcher Jeffrey Kelu saying the study was “moderate in size,” short, and drawn from one at-risk population, while noting that even the misaligned group improved. (sciencemediacentre.org) That matters for anyone trying to restart a routine after a slump: the evidence does not say skip exercise unless you find the perfect hour. Public health guidance still centers on total activity, with the National Health Service advising adults to do at least 150 minutes of moderate activity a week and strength work on at least two days. (nhs.uk) The newer idea is narrower than that: if a routine keeps failing at 6 a.m. or 8 p.m., the clock may be part of the problem. In this study, moving sessions to a time that matched participants’ natural schedule made sticking with exercise work better on paper and in practice. (openheart.bmj.com)
