Evidence & Training · Running & Conditioning
Should You Run Before or After Lifting Weights?
How the order of strength and endurance training affects strength and aerobic fitness, when order matters, and how to arrange combined sessions.
If you only have time for one session a day, cardio and weights often end up in the same workout. Then the question becomes practical: which goes first? Gym folklore offers both answers — cardio first to warm up and burn fat, or weights first to protect strength.
A meta-analysis of studies that compared the two sequences gives a clear, if modest, answer for strength, and a reassuring one for aerobic fitness. Beyond that, the right order depends on what you are training for.
This article explains the evidence and gives a decision rule you can apply to your own week.
Quick answer
If strength is the priority, lift first: lower-body 1RM gains were greater when strength training came before endurance training, while aerobic capacity improved equally with either order [1].
If endurance performance is the priority, do the key run first. When possible, separate the two by several hours — interference is smaller when they are not in the same session [2].
What the evidence says
Moderate evidenceA 2018 systematic review and meta-analysis compared chronic training programmes in which strength and endurance work were performed in the same session in either order. Lower-body 1RM was significantly higher when strength training preceded endurance — a pooled difference of about 4 kg — whereas aerobic capacity (VO2max) was not affected by training order [1].
A broader 2022 meta-analysis on concurrent training adds context: muscle growth and maximal strength were generally not compromised by adding aerobic training, but explosive strength was, particularly when both were performed in the same session [2].
Why order matters for strength
Limited evidenceA hard run or interval session before lifting leaves the legs fatigued and depletes some of the energy needed for heavy efforts. You lift lighter loads and complete fewer quality reps. Over weeks, that reduced training quality is a plausible reason for smaller strength gains.
The reverse is less of a problem for aerobic fitness, which is why order showed no effect on VO2max. A tired runner after lifting may run a little slower that day, but the aerobic adaptations still accrue.
A simple decision rule
Put first whatever matters most that day. On a heavy squat day, lift first and keep the run easy. On a key interval or tempo-run day, run first and keep lifting light, or train upper body.
Better still, separate them: morning run, evening lift; or run and lift on different days. When that is not possible, a 10–15 minute easy warm-up on a bike or rower before lifting is not the kind of cardio that causes problems.
Common mistakes
- 1
Hard intervals before heavy leg training
This combination leaves the least capacity for the strength work that most needs freshness.
- 2
Assuming cardio first burns more fat
Body composition depends on total energy balance over weeks, not on the order of exercise in one session.
- 3
Ignoring the session's main goal
Order is a priority decision. If the run is the key session of the week, do it fresh.
Practical takeaway
- 1Lift first when strength is the session's priority [1].
- 2Run first when an important endurance session is the priority.
- 3Separate the two by several hours or days whenever you can.
- 4Use easy cardio, not intervals, as a warm-up before lifting.
- 5Keep heavy lower-body sessions away from hard runs.
Conclusion
Order matters, but only modestly — and only for strength. Lifting first protects lower-body strength gains, while your aerobic fitness improves either way.
Decide by the day's priority, separate sessions when life allows, and you can train for both without either goal suffering much.
References
- [1]Murlasits Z, Kneffel Z, Thalib L. The physiological effects of concurrent strength and endurance training sequence: A systematic review and meta-analysis. Journal of Sports Sciences. 2018;36(11):1212–1219. Systematic review and meta-analysis doi.org/10.1080/02640414.2017.1364405
- [2]Schumann M, Feuerbacher JF, Sünkeler M, et al. Compatibility of concurrent aerobic and strength training for skeletal muscle size and function: an updated systematic review and meta-analysis. Sports Medicine. 2022;52(3):601–612. Systematic review and meta-analysis doi.org/10.1007/s40279-021-01587-7
This guide summarises published research for healthy adults. It is general information, not medical advice — if you have a health condition, injury or take medication, talk to a qualified professional before changing your training, diet or supplements.
