The Bank of America Chicago Marathon starts next Sunday, 11 October, and the Nike Melbourne Marathon Festival runs the same weekend. For anyone finishing one of them, or any other autumn race, the week afterward has a familiar shape: legs like wet sand, a training log with nothing in it, and a vague plan to "do some strength work" that rarely survives the first long run of the next block. That plan deserves a better chance, because the week after a race is the cheapest moment of the year to start lifting. The miles that normally compete for your legs are gone, and the research on what lifting does for runners is more specific than the usual advice suggests. It helps, it helps in one particular way, and it only works at a particular intensity.
What lifting does for a runner, and what it leaves alone
Running economy is the oxygen you burn to hold a given pace, and it is the measure strength training moves most reliably. A 2018 systematic review in Sports Medicine by Richard Blagrove, Glyn Howatson and Philip Hayes pooled 24 controlled studies of distance runners. Running economy was measured in 20 of them and generally improved by 2 to 8 percent compared with runners who only ran, while 1.5 to 10 km time trials tended to get faster too. A 2016 meta-analysis in the Journal of Strength and Conditioning Research found a large effect on running economy in five trials of 93 high-level runners, using two to three sessions a week for 8 to 12 weeks. Those results describe how efficient the engine is, not how big it is: in Blagrove's review, VO2max, velocity at VO2max and blood lactate were typically unchanged. Lifting does not replace miles, and nobody has shown that it enlarges your aerobic base. What it does is make each stride cost a little less oxygen at a given pace.
The evidence is not tidy, though. Blagrove's team concluded that the benefit was "not a consistent finding" across every study they reviewed, and the trials scored only 4 to 6 on the PEDro scale of methodological quality. If you are worried that lifting will make you bulky or slow, that part of the evidence is reassuring: the same review found that body composition was not negatively affected.
Heavy beats light
Of five strength methods compared with runners who did little or no lifting, three improved running economy and two did not.
That count comes from a 2024 meta-analysis in Sports Medicine by Llanos-Lagos and colleagues, covering 652 runners on programs of 6 to 24 weeks and one to four sessions a week. High-load training, defined as 80 percent or more of your one-rep max, produced a small improvement in running economy, and combining methods produced a moderate one. Plyometrics helped at speeds up to 12 km/h, which is five-minute kilometers or roughly eight-minute miles. Submaximal loads of 40 to 79 percent of one-rep max and isometric holds showed no improvement over the control groups. A companion analysis from the same group looked at performance in 894 runners: high-load training gave a moderate improvement in time-trial and time-to-exhaustion results, combined methods a large one, and sex, age and lifting experience did not change the result. Neither analysis found any change in VO2max. The certainty of the evidence ranged from very low to moderate, so read the effect sizes as a direction rather than a promise.
The older evidence pulls the other way here. Four of the five trials in the 2016 meta-analysis used moderate loads of 40 to 70 percent of one-rep max and still reported large benefits, mostly in small groups of highly trained runners. The newer, larger pool separates the methods more cleanly, so it is the one to build a plan on.
In practice, skip the 20-rep leg circuit and lift sets of roughly three to six reps, with a weight that forces you to slow down on the last rep while your form holds. If you have never done a loaded squat or deadlift, spend the first three or four weeks learning the patterns at moderate weights before going heavy, because heavy only works when the technique is boringly consistent.
The part that matters more for women: bone and fuel
A 2021 systematic review and meta-analysis of 38 prospective studies found that women and men get injured at about the same overall rate, 20.8 versus 20.4 injuries per 100 runners. Bone stress injuries were the exception: the risk ratio for men was 0.52, which puts women at roughly twice the risk, while men had more Achilles tendinopathy. Running loads bone, but a heavy squat or deadlift is a different kind of stimulus, and that is the logic behind the trials we covered in our piece on bone density and resistance training. No study cited here shows that lifting prevents stress fractures in runners, so treat the bone argument as a sensible inference, not a proven shield.
Fuel is the other half, and it is where a lifting block can backfire. The International Olympic Committee's 2023 consensus statement on Relative Energy Deficiency in Sport describes a syndrome caused by prolonged or severe low energy availability, with impairments that include reproductive function, musculoskeletal health and immunity, and a higher risk of injury. Published estimates for indicators of low energy availability in female athletes run from 23 to 79.5 percent, a spread the statement blames on inconsistent methods and the lack of a single definitive diagnosis, which means no headline number can tell you your personal odds. Eat enough to cover the training you are actually doing, especially in the first month of a new lifting block, and do not cut calories to "lean out" before a race. A period that has become irregular or has stopped during heavy training is a reason to see a doctor or a sports dietitian, not a sign the plan is working. Fatigue that refuses to lift deserves a blood test too, and our piece on iron deficiency in active women explains why.
A two-day template
Two sessions a week is enough, and it happens to match what the major guidelines already ask of every adult: the NHS, the US Physical Activity Guidelines, Australia's 24-hour movement guidelines and the WHO all recommend muscle-strengthening on at least two days a week. Blagrove's review suggests two to three. Budget about 45 minutes for each.
- Session A: trap-bar or Romanian deadlift, 3 to 4 sets of 3 to 5 reps; split squat or step-up, 3 sets of 5 per leg; slow standing calf raises, 3 sets of 6 to 8; then a few short sets of pogo hops or low box jumps to finish.
- Session B: back or front squat, 3 sets of 4 to 6; hip thrust, 3 sets of 5 to 6; bent-knee calf raises, 3 sets of 8 to 10, plus a row or pull-up variation to keep the upper back honest.
- Add weight once every set reaches the top of its rep range with clean form. When a rep turns into a grind and technique frays, that set is over, whatever the plan says.
The trials in the 2016 meta-analysis capped jumping at up to about 200 contacts per session, so begin far below that and let our plyometrics guide set the progression.
Fitting it around the miles
The interference effect is real, and it is the reason to keep expectations modest. A 2012 meta-analysis of 21 studies by Wilson and colleagues found that adding running to a lifting program blunted gains in both muscle size and strength, while adding cycling did not, and the penalty grew with how often and how long the endurance sessions were. That is why high-mileage weeks and muscle gain rarely coincide, and why the goal here is strength rather than size. Two lifting sessions a week sit comfortably under that ceiling for most runners, but timing still matters. The research does not settle exact spacing, so use a sensible default: put lifting on the same day as your hardest run or workout so the easy days stay easy, and keep heavy leg work out of the 24 hours before a long run.
Where you are in the calendar
The right plan depends on what is on your calendar, so find your row.
| Where you are | What to lift | Why |
|---|---|---|
| Racing within two weeks | One short session early in race week: same weights, about half the sets, nothing new | A two-week taper that cuts volume by 41 to 60 percent and leaves intensity and frequency alone |
| Just finished a race | Wait until stairs stop hurting, then two sessions a week at moderate loads for two weeks before going heavy | Soreness is the limiter, and our muscle soreness piece covers what it does and does not mean |
| Racing in late November or December | Start this week: two heavy sessions a week until a two-week taper begins | The trials that showed large economy gains ran 8 to 12 weeks |
| No race planned | Two heavy sessions a week through the winter | Strength you build now is cheap to keep later |
The taper figures come from a meta-analysis of 27 studies by Bosquet and colleagues that covered overall training load, not lifting alone, so "about half the sets" is an application of the finding rather than a result in itself. Keep the weights where they were. The reason that works is Spiering and colleagues' 2021 review of the minimal dose of exercise: in younger adults, strength and muscle size held for up to 32 weeks on as little as one session a week and one set per exercise, provided the relative load stayed the same, although older adults may need two sessions and two to three sets.
Pick your row, put the first session in the calendar this week, and write down the weight you use for your heaviest set of five. Four weeks from now, that number is the simplest evidence you will have that the plan is working.