Start with the time you actually have
You have time before work, but someone says evening workouts build more muscle. Is your morning session a compromise? The studies below do not establish a single best time for everyone. Our practical starting point is to choose a slot you can use without having to rearrange your whole day.
First, separate two questions: when can you fit in training, and when do you perform best at a particular task? You can make a useful decision about your schedule without claiming to have found your biological peak.
What the studies actually compared
A six-week randomized study of 36 healthy adults compared morning resistance training, evening resistance training, and a control group. It found no statistically significant difference in changes between groups for the measured strength and muscle-thickness outcomes. This was a small, short study, with no formal advance calculation of the sample size needed. It cannot prove that the times are equivalent. [1]
A different, 24-week study of 42 young men combined strength and endurance training. Leg-press strength improved similarly; muscle growth favored evening training during weeks 13–24. [2]
These are different programs and populations, not a timetable for your living room. Neither study directly tested a home bodyweight routine. Their results are a reason to be cautious with “always train at this hour,” whether the claim favors mornings or evenings.
Check what the slot costs you
Look beyond the start time. A session also needs space, setup, and whatever time you need afterward. Before-work training may fit on paper but collide with a shared bathroom. An evening slot may disappear whenever work runs late. Those are practical constraints worth writing down, not character flaws.
For example, if evening training repeatedly pushes your bedtime later, count that as a drawback of that slot. If an early alarm would shorten your night, count that too. This is a scheduling check, not a claim that evening exercise necessarily harms sleep or that morning exercise is healthier.
Try a schedule, not a personal laboratory
For your next few already-planned sessions, choose one feasible time window. Keep your usual suitable routine and note three things: did you start, did you have to rush, and what did training displace? Our suggestion is an observation exercise, not a validated test or a reason to add extra workouts.
If the same obstacle keeps returning, try a different window. Keep performance records separate: a few sessions at different times cannot show which hour builds more muscle. You are answering a smaller, useful question: where does training fit in the week you actually live?