LIFT FIRST OR CARDIO FIRST? WHAT THE SESSION-ORDER RESEARCH FOUND

Lift first or run first? It's one of the most common questions in hybrid training, and it usually gets a confident one-line answer. Chapter 2 of The Hybrid Athlete Protocol went through the session-order research and found something less tidy: the studies don't agree, and the reason they don't is useful.

What "Session Order" Actually Means in the Research

The question here is narrow. When strength work and endurance work happen in the same session, does it matter which comes first? That's different from asking whether to train them on separate days, and the studies below don't always test the same comparison, which is part of why their answers differ.

Eddens 2018: An Order Effect on One Outcome

In 2018, Eddens, van Someren, and Howatson published a systematic review and meta-analysis in Sports Medicine pooling 10 studies of healthy adults on concurrent programs lasting at least five weeks. Each study compared resistance-then-endurance against endurance-then-resistance within the same session.

What they reported:

• Resistance-first produced greater gains in lower-body dynamic strength: a weighted mean difference of 6.91% (95% CI 1.96 to 11.87, p = 0.006).
• No order effect on lower-body muscle size (p = 0.40) or static strength (p = 0.98).
• No order effect on maximal aerobic capacity or body fat percentage.

So the order effect in this analysis showed up for one outcome, dynamic leg strength, and not for the others.

Markov 2023: The Only One in the 50-to-73 Age Range

Markov, Hauser, and Chaabene's 2023 Sports Medicine meta-analysis pooled 15 randomized controlled trials with 566 participants aged 50 to 73. It compared concurrent training against passive controls, then broke the results down one training factor at a time.

• Strength-before-endurance within the same session was associated with larger strength effects (SMD 1.00) than separate sessions (SMD 0.55).
• For cardiorespiratory endurance, separate sessions were associated with larger effects (SMD 0.58) than endurance-before-strength in the same session (SMD 0.49).

Two limits belong next to those numbers. These were single-factor subgroup breakdowns across different trials, not a head-to-head test of order. And as the book notes, the differences between those order subgroups were not statistically significant. Markov still matters here because it's the only one of these analyses built entirely on adults over 50.

Ruiz-Alias 2022: A Small Trial Pointing the Other Way

In a 2022 trial in the Journal of Sports Sciences, Ruiz-Alias and colleagues assigned 24 recreationally trained young adults to the same 8-week program in two orders: all-out running sprint intervals plus back squat and bench press. Both groups improved on every fitness component. The endurance-first group showed moderate gains in squat jump (3.82 cm), countermovement jump (3.76 cm), and VO2max (4.75 mL/kg/min). The strength-first group's gains on those three were small, with confidence intervals that crossed zero.

The authors' own wording was that greater lower-body power and aerobic gains "might be induced" by the endurance-first order. It's one small trial in young adults, so it doesn't outweigh the pooled analyses above. It does show the direction isn't settled.

Held 2026: The Broadest Look So Far

A 2026 umbrella review in Sports Medicine by Held and colleagues pooled 17 meta-analyses covering 144 studies and 1,492 healthy participants. On order, the authors reported no significant effects of training sequence overall. They also described a trend suggesting that resistance before endurance may favor strength and hypertrophy gains, and noted that data from highly trained and elite athletes remain scarce.

The same review found that, compared with resistance training alone, concurrent training produced comparable strength, power, and hypertrophy outcomes while improving aerobic capacity.

Why the Studies Disagree

Put side by side, the four sources differ on who was studied (young adults, mixed adults, adults 50 to 73), what was compared (same-session order, or same session versus separate days), and which outcome was measured. When the answer changes with the outcome, one universal rule will be wrong for somebody.

The book's conclusion is that session order is a lever, not a law: it can tilt results toward the adaptation trained first in some outcomes and populations, but the effect isn't consistent enough to be a fixed rule.

What the Evidence Doesn't Cover

None of these analyses randomized trained masters athletes to one order or the other and followed them. Markov is the closest to this audience, and it compared concurrent training against doing nothing, not order against order in a single trial.

The Protocol

How Chapter 2's finding carries into the book's system:

• Decide what you're prioritizing this block (strength, endurance, or balanced) before choosing an order. Chapter 4 builds that decision.
• In a strength-priority block, the book puts strength first while you're fresh, the configuration associated with the largest pooled strength effects in Markov's analysis.
• In an endurance-priority block, the book separates the sessions onto different days when your schedule allows, following Markov's endurance finding.
• When life forces both into one session, the book's approach is to put first whichever session you most need to perform well that day, then watch how you respond.

Battle Hard. — Will Power

Sources

1. Eddens L, van Someren K, Howatson G. The role of intra-session exercise sequence in the interference effect: a systematic review with meta-analysis. Sports Med. 2018;48(1):177-188. PMID 28917030
2. Markov A, Hauser L, Chaabene H. Effects of concurrent strength and endurance training on measures of physical fitness in healthy middle-aged and older adults: a systematic review with meta-analysis. Sports Med. 2023;53(2):437-455. PMID 36222981
3. Ruiz-Alias SA, García-Pinillos F, Jaén-Carrillo D, Pérez-Castilla A. Effect of intra-session exercise sequence of an 8-week concurrent training program on the components of physical fitness in recreationally trained young adults. J Sports Sci. 2022;40(15):1722-1731. PMID 35856521
4. Held S, Wolf L, Rappelt L, et al. Maximizing adaptations in concurrent training: an umbrella review of meta-analyses. Sports Med. 2026;56(6):1489-1512. PMID 41762427