WHY STRENGTH AND ENDURANCE MAY BE THE BEST TRAINING COMBINATION AFTER 50

For decades the advice was simple: pick a lane. Endurance athletes ran. Strength athletes lifted. Mixing the two seriously, past a certain age, was treated as either a beginner's confusion or a recipe for getting neither benefit. A 2023 systematic review of 566 adults specifically in their 50s, 60s, and 70s says that advice is outdated — and its breakdown of individual training variables shows how session order and program length were associated with the results.

What the research actually found

Markov, Hauser, and Chaabene published a systematic review and meta-analysis in Sports Medicine in 2023, pooling 15 randomized controlled trials and 566 participants with a mean age of 61 (range 50–73) — squarely the reader this protocol is written for. Compared against a passive control group, combined strength-and-endurance training ("concurrent training," in the research literature) produced moderate improvements in strength (standardized mean difference 0.74) and power (0.50), and a smaller but real improvement in cardiorespiratory endurance (0.48). Balance did not improve without dedicated balance work added on top.

The headline finding isn't just "it works." It's that training both at once, in this specific age range, produced real, measurable gains in both directions — not a watered-down version of either.

What the Breakdown by Training Variable Showed

The same review broke its results down one training variable at a time. For strength gains specifically, doing the strength session before the endurance session, on the same day, was associated with larger strength effects than separate days (SMD 1.00 vs. 0.55). For endurance gains, separate days were associated with larger effects than doing endurance before strength in the same session (0.58 vs. 0.49). For strength and power, 12-week programs were associated with larger effects than 21-week programs, and three sessions a week with larger strength effects than four.

These were single-factor breakdowns across different trials, not head-to-head comparisons, so they show associations rather than a proven best order. A 2026 umbrella review of 17 meta-analyses by Held and colleagues reported no significant effect of training sequence overall, while noting a trend suggesting resistance before endurance may favor strength.

Used carefully, it's still practical. If strength is your current priority, putting strength first in the session matches the configuration with the largest pooled strength effects in this review. If endurance is the priority this block, separating the sessions matches its endurance finding. That's a reasonable starting point, not a settled rule. For the fuller picture on order, see what four session-order studies found.

Where the old "interference effect" warning still holds up

The concern about mixing strength and endurance training isn't invented — it has a real name in the exercise-science literature (the interference effect) and a real foundational meta-analysis behind it: Wilson and colleagues, published in the Journal of Strength and Conditioning Research in 2012. That review found interference effects depended on the modality, frequency, and duration of the endurance training. Resistance training paired with running was associated with significant decrements in strength and hypertrophy. Resistance training paired with cycling did not show the same pattern.

That's a useful, specific piece of information, not just a caveat: if maximizing strength is the goal for a given training block, the endurance modality chosen matters, and running was associated with more interference than cycling in that analysis (rowing wasn't part of the comparison).

The takeaway, not the whole plan

None of this adds up to a rigid rule that applies identically to every reader — training age, current fitness, and specific goals all shift the picture, and a systematic review of 15 trials is a strong starting point, not a substitute for individualized coaching. What the randomized evidence in this age range does support is that strength and endurance can be built together after 50. Session order and endurance modality were associated with differences in the pooled results and are worth using deliberately, but they aren't settled rules.

The Protocol

• If strength/power is this block's priority: putting strength before cardio in the same session matches the configuration with the largest pooled strength effects in Markov's review.
• If endurance is this block's priority: put real separation between your hard strength sessions and your hard endurance sessions — different days, not back to back.
• If strength is the priority and you still want conditioning work, cycling is the option with direct comparison evidence behind it — Wilson's analysis found strength decrements with running but not cycling. Rowing is a reasonable low-impact choice too, but it wasn't tested in that comparison.
• In this review, 12-week programs were associated with larger strength and power effects than 21-week programs. Reassess and adjust rather than running the same block indefinitely.

Sources

1. 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
2. Wilson JM, Marin PJ, Rhea MR, Wilson SM, Loenneke JP, Anderson JC. Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises. J Strength Cond Res. 2012;26(8):2293-2307. PMID 22002517
3. 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