When is the Best Time to Exercise? (Does it Matter?)

Valerie Teal

Apr 29

3 min read

When is the best time to work out? Well the easy answer is whenever it works best to fit into your schedule. But what if you have a choice? Does it matter?

People love to argue about the “best” time to work out, but the research is far less dramatic than the headlines. If you strip away the hype, the evidence points to one consistent conclusion: exercise is beneficial at any time of day, and timing plays a much smaller role than people think.

I’m retired so I guess I could do whatever I want. Mostly over the years it’s been after work / evening. At different periods in my life I’ve also done mornings and lunchtime – although never late evening. I liked mornings because it gets it done, only one shower, and you just get on with your day, But .. you have to haul your lazy butt out of bed and get going which is all too easy to say “I’ll go tomorrow’. Lunchtime worked beautifully when my job allowed it, but during the pandemic? Forget it. Meetings swallowed the entire middle of the day. My personal sweet spot is late morning — a few hours after breakfast, not too close to lunch.

But preference aside, what does the data actually say?

What Researchers Have Studied

Time‑of‑day exercise studies typically look at outcomes like:

Blood pressure
Glucose regulation and insulin sensitivity
Metabolic syndrome (a composite of BP, glucose, HDL, waist circumference, triglycerides)
Performance metrics
Weight‑related outcomes

Across these categories, findings are inconsistent — not because the research is bad, but because human physiology is complex and individual differences matter more than the clock.

Where Morning Exercise Shows an Edge

Some studies report modest advantages for morning workouts, especially for:

Blood pressure reduction
Improved fasting glucose
Slight improvements in metabolic‑syndrome scores
Slight improvement in weight management

One study that broke down metabolic syndrome into its components found a small benefit for morning exercisers — but the effect size was tiny, and the authors noted that exercise at any time outperformed not exercising at all.

Morning exercise may also help with adherence for some people simply because it’s “done before the day gets messy”.

Where Afternoon or Evening Exercise Shows an Edge

Other studies have reported some advantages for later in the day:

Higher strength and power output later in the day
Better anaerobic performance
Improved perceived exertion (workouts feel easier)
Slightly better glucose control after meals when training in the afternoon

These findings make sense: body temperature, reaction time, and neuromuscular efficiency naturally peak later in the day.

But again: the differences are small - not enough to override personal preference or schedule.

What’s Consistent Across All Studies

This is the part that actually matters:

Exercise groups — regardless of timing — always outperform non‑exercise groups.

So far, studies haven’t shown that time of day directly causes better weight‑loss outcomes. When differences do appear, they’re usually explained by behavioral factors — especially consistency and adherence — rather than the clock itself.

What the Research Says About Adherence

Morning exercisers often show higher consistency. In the Midwest Exercise Trial 2, people who completed most of their workouts in the morning lost more weight than evening exercisers — despite similar exercise prescriptions. Researchers suggest this may reflect stronger routine formation rather than a physiological timing effect.
Consistency matters more than the clock. Studies of long‑term weight‑loss maintainers show that people who exercise at the same time each day accumulate more weekly activity and maintain weight loss more effectively, regardless of whether they prefer morning or evening.
Randomized trials show similar weight loss across times of day. In a 12‑month RCT comparing morning vs. evening exercise, both groups lost weight and improved health markers, with no meaningful differences between them — and adherence was similar in both groups.

So… Does Timing Matter for Most People?

For elite athletes: possibly.
For metabolic‑disease management: maybe a little.
For the average person trying to stay active and healthy: probably not.

My take for now is go whenever it works. I usually go with AF Grandpa so it’s whatever works with his work schedule, which is usually at the end of the (work) day. Getting it done is so much more important than WHEN you get it done.

What I Do

- Moderate workouts first thing in the morning (pushups, lunges, etc.)

- Main workout whenever in the day it works best. Typically this is late afternoon.