Run before or after lifting? What the studies found

If lower-body strength is what you're building, lift first. Two meta-analyses found bigger leg-strength gains when lifting came before the endurance work in the same session, and neither found that order changed aerobic fitness.¹² Better than getting the order right, though, is a gap: in the trials that tested it, separating the two by a few hours removed most of the cost.

That's the short answer. The longer one depends on which half you care about more this month.

What the sequencing meta-analyses found#

Both papers compared the same thing: groups that lifted then did endurance work in one session, against groups that did it the other way round, over weeks.

Murlasits and colleagues pooled lower-body 1RM and VO2max.¹ Lifting first gave a lower-body 1RM about 3.96 kg higher (95% CI 0.81 to 7.10 kg). For VO2max the difference was 0.39 ml/kg/min (-1.03 to 1.81), which is nothing.

Eddens and colleagues used percentage change across 10 studies and 245 people.² Lifting first gave 6.91 percent more lower-body dynamic strength (1.96 to 11.87). Order made no difference to muscle size (1.15 percent, -1.56 to 3.87), static strength (-0.04 percent), VO2max or body fat. To count as one session, the two had to be no more than 15 minutes apart.

Two things to keep in mind. Six of Eddens' ten studies were in untrained people, three in recreationally active people and one in professional athletes. And 4 kg on a squat over a training block is a real but modest edge. If you're running first because that's when the track is free, you're not throwing your training away.

Schumann's 2022 meta-analysis adds a caution from another angle. Pooling the studies that trained both in one session, they found no order-specific effect on explosive strength. What hurt was doing both close together, whichever came first.³

The gap matters more than the order#

Same-session costs show up repeatedly. Separate the sessions and they mostly go away.

• Petré 2021, trained people, lower-body 1RM: same session (under 20 minutes apart) ES -0.66 (-1.08 to -0.25). Different sessions (more than 2 hours apart) ES -0.10 (-0.43 to 0.23), not significant.⁴
• Schumann 2022, explosive strength: significant cost within a session (20 minutes or less), none when sessions were at least 3 hours apart.³
• Robineau 2016, 58 amateur rugby players over 7 weeks, two strength and two aerobic sessions a week, strength always first.⁵ With no recovery between them, bench and half-squat gains were lower than with a 6-hour or 24-hour gap, or lifting alone. The 24-hour gap also gave the biggest VO2peak gains. The authors' conclusion: avoid less than 6 hours between the two.
• Sale 1990, separate days versus same day, 20 weeks.⁶

Leg press 1RM gain over 20 weeks

	Value (%)
Same session, 2 days/week	13
Separate days, 4 days/week	25

Sale et al. 1990: lifting and cycling intervals in one session twice a week (n = 7) versus on four separate days (n = 8). Abstract figures.

The Sale groups did identical work. Splitting it across separate days nearly doubled the leg-press gain, while muscle size and VO2max rose about the same in both groups. It's 15 people, so treat it as a signal that fits the pattern, not as proof on its own.

Put side by side, the definitions explain why "same day" and "same session" get mixed up online:

The biggest costs sit in the 0 to 20 minute window. A same-day gap of several hours removed most of them in these studies, though Robineau's 24-hour group still beat the 6-hour group on VO2peak and fast knee-extension strength.

The other direction: lifting before a run#

Most of this research asks what running does to lifting. The reverse is real too. Doma and colleagues reviewed the evidence that a lifting session leaves fatigue that can lower the quality of endurance sessions for several hours to days, through altered running mechanics, soreness and reduced muscle glycogen.⁷ If the run is the session that matters, a heavy leg day the evening before is the thing to move, not the order within a day.

And if you're a runner who only wants to keep strength, the "wrong" order works fine. In Schumann's 2015 trial, recreational runners did two strength sessions a week straight after a 35 to 45 minute run, for 24 weeks.⁸ Their leg press 1RM held, while the run-only group lost 5 percent. Both groups got faster over 1,000 m. The run-only group improved a bit more (13 percent against 9 percent), but the study found no endurance benefit from the added strength work over that period.

Morning or evening#

One long trial looked at time of day on top of order.⁹ Forty-two young men did combined sessions for 24 weeks, in the morning or evening, run first or lift first. Every group gained 14 to 24 percent on leg press 1RM. Over weeks 13 to 24 the evening groups added more muscle, and the endurance-first groups had a borderline edge in cycling time to exhaustion (p < 0.051). None of that showed up in the first 12 weeks. So time of day is a fine-tuning question for long blocks, not a reason to rearrange your life.

Decision table#

The table is our reading of the studies above, not a tested protocol, and the last row most of all. The sequencing and gap studies measured legs. Nobody has shown that a run blunts a bench press. If your double days pair a run with upper-body lifting, the order is mostly a scheduling choice.

What my own double days look like#

My log doesn't show a fixed rule. Between 1 June and 21 October 2026 I had 15 days with both a run and a lifting session. I lifted first on 9 of them and ran first on 6. On 9 of the 15 the second session started less than an hour after the first ended. On 5, all in Bangkok in June and July, I lifted in the late morning or around midday and ran in the evening, 4 to 7 hours later.

Ken's double days, June to October 2026

	Value (days)
Lift first	9
Run first	6
Gap under 1 hour	9
Gap of 4 to 7 hours	5

Days with both a run (2 km or more) and a lifting session, from Ken's hybridAF log, read 2026-10-22.

The more telling part: wherever the log lists the exercises, the lifting on those days was upper body, apart from one session with walking lunges. Two July days also had HYROX sled or sandbag circuits, logged without a start time, so I can't say which came first there. Otherwise the question this article is about, legs then run or run then legs, barely came up for me. That's worth checking in your own log before worrying about order. How to split a hybrid training week is about where the leg work goes.

If you only get one slot a day#

If you can't split a day into a lunchtime lift and an evening run, and you've got one visit, the evidence points to a few things.

Lift first when strength is this block's priority. It's the order both sequencing meta-analyses favoured for leg strength, and it cost nothing on VO2max.¹²

Run first when the run is the session that matters, like intervals before a race. Running tired off a heavy lift is the bigger risk to that session's quality.⁷

Keep the second half honest. If you lift first, the run after should usually be easy. A hard run straight after heavy squats gets the worst of both: a tired run and a same-session hit to the strength work.

And where the calendar allows, alternate days instead of doubling up. Sale's trial is the clearest case for it.

The reasons behind those costs are in the interference effect. If you plan around a calendar, the planning your week guide shows how hybridAF lays sessions into the free time you actually have.