How Much Should Runners Strength Train Per Week?

If you ask most runners how much strength work they should be doing, you will get one of two answers. Either they are not doing any because they are worried it will make them heavy and slow, or they are doing two sessions a week and wondering why their running still feels terrible. The question of how much is reasonable, but it is also incomplete. How much strength training a runner needs depends on what phase of training they are in, how much running they are already doing, and what they are actually trying to get out of the gym. Get those variables right and the answer becomes much clearer.

Why the Generic Answer Does Not Help

The standard advice is two days a week, and that is not wrong exactly. But it tells you almost nothing useful on its own. Two heavy lower body sessions will compromise your running if you are already doing 60 or 70 kilometres per week and scheduling them poorly. Two low-effort accessory sessions might do very little if you are treating the gym like a gentle warm-up. The dose matters as much as the frequency, and the dose has to be calibrated against what is happening in your run training. Frequency is just one variable in a much more interesting equation.

What Strength Training Is Actually Doing for a Runner

It helps to be clear on what you are trying to achieve before you decide how often to do it. Strength training for runners is not about building muscle mass. It is about building tissue capacity, which means developing the tendons, bones and connective tissues that absorb load every time your foot hits the ground. A runner doing 50 kilometres per week is accumulating somewhere around 40,000 foot strikes. The chassis holding all of that together needs to be robust. If you have read Part 1 and Part 2 of why new runners should not just run more, you will recognise the engine and chassis framework. Strength work builds the chassis. How often you do it depends on what phase your engine is in.

The Two Variables That Determine Your Answer

Two things drive the answer more than anything else: your training phase and your current running volume. These are not independent of each other, but they each pull the prescription in slightly different directions.

Training phase matters because the purpose of strength work shifts over a season. When mileage is low and you are in an off-season or early base period, you can push harder in the gym because your legs are not already absorbing significant run load. That is the window to build something. As you move into a race build and weekly mileage climbs, the role of the gym changes. You are maintaining what you built, not adding to it, and the sessions need to fit around your run quality rather than compete with it.

Running volume matters, but the number on its own means very little. What actually determines how much capacity you have left for gym work is where that volume sits relative to your individual ceiling. Someone running 30 kilometres a week who has had a long break from training, is carrying some extra weight, or simply does not have a deep running background yet might already be close to their current limit. Meanwhile, someone running 70 kilometres a week who has handled 140 in the past, has well-adapted tissues and a strong aerobic base, might actually have more room to absorb gym work, because 70 kilometres is well within what their body is capable of managing. The number matters less than the question of how hard that volume is working the individual doing it. That context is what determines how much you have left for the gym.

A Practical Framework by Training Phase

Off-season or base phase: This is when you build. Two to three sessions per week is appropriate here, with meaningful loads and enough recovery between sessions to actually adapt. This is the time for heavy single leg work, Romanian deadlifts, step-ups with load — the kind of exercises that actually build tissue capacity in runners. Not bodyweight circuits and banded clamshells. If you are only ever doing light gym work, you are not building tissue capacity, you are just going through the motions.

Build phase: Two sessions per week remains the target, but this is where a lot of runners make the mistake of gutting the intensity as mileage climbs. Volume is the variable to pull back, not load. Intensity is what drives adaptation and maintains the qualities you spent the off-season building. A shorter session at meaningful weight does considerably more for you than a longer session at half the effort.

This is also where manipulating other variables becomes useful. Range of motion is one of the most underused levers in a runner's strength program. If a full barbell deadlift feels like too much during a heavy run week, a rack pull from just below the knee cuts the range significantly while keeping the load and the stimulus intact. A deep squat can become a box squat. These are not regressions. They are practical adjustments that let you keep training at a useful intensity without the full recovery cost. You can also shift the exercise variation, the tempo, or the rep scheme. There is a lot you can control inside a strength session before the right answer becomes simply go lighter and do less.

Race phase or peak week: One session, reduced volume, nothing new. The goal is to maintain the adaptation without adding fatigue that shows up on race day. Keep the movements familiar, cut the sets back, and keep some intensity present even if the session is short. Getting out of the gym in 30 to 40 minutes is fine here.

Where Runners Go Wrong

The most common mistake is dropping intensity in the gym the moment run volume increases. The reasoning makes sense on the surface: legs are tired, mileage is up, so back off everything. But intensity is the stimulus. Remove it entirely and you are just going through the motions. The better adjustment is to reduce the number of sets, shorten the session, or modify the range of motion, while keeping the load close to where it was.

The second mistake is cutting strength entirely when training ramps up, which tends to be exactly the wrong time to stop. As run volume increases, so does tissue stress. That is when the chassis needs to be most robust. One well-managed session per week during a heavy run block is far more valuable than nothing, and it does not take much to maintain what you have already built.

How to Structure the Week: The High-Low Model

Frequency and exercise selection only get you so far if the weekly structure is working against you. One of the more effective approaches for runners combining strength and run training is a high-low model, where you deliberately stack your hardest sessions on the same day and follow them with genuine recovery days.

The logic is straightforward. Operating at 65 percent effort across six days is a reasonable description of how a lot of amateur runners train, and it tends to produce a kind of chronic, low-grade fatigue that is difficult to shake. A better model pushes two or three days to around 80 percent and brings the others back to 30 or 40. You accumulate more useful training stress on the high days and you actually recover on the low ones, rather than drifting along somewhere in the middle all week.

In practical terms this often means pairing a run session with a strength session on the same day, taking the following day easy or off, then repeating. Where the schedule allows, the strength session generally works better placed after the run rather than before it, and ideally not sitting directly in front of a quality interval session the next morning. That said, life does not always allow for the optimal setup, and occasionally having to fit a gym session into a less-than-ideal slot is not a disaster. If that happens, there are variables you can adjust, a shorter session, reduced range of motion, less total volume, to manage the fatigue cost without scrapping the session entirely.

What This Looks Like in Practice

Our own coach Riley is a good example of this working exactly as intended. He cut his running volume back and kept two gym sessions per week at real load, not bodyweight work and resistance bands but actual strength training. The result was less fatigue, legs that felt stronger going into quality sessions and better recovery between them. He just ran a 1:22 half marathon off the bike in his most recent 70.3, taking three minutes off his previous best. Less running did not make him slower. It made him more consistent, and the gym work held the chassis together while the engine stayed sharp.

For a runner in a build phase sitting around 50 kilometres per week, a week structured around the high-low model might look something like this. Monday easy run plus strength session. Tuesday off. Wednesday intervals. Thursday easy run plus strength session. Friday off. Saturday long run. Sunday off. The hard days are genuinely hard, the easy days are genuinely easy, and the strength work is not sitting directly in front of a quality run session. That is the version of the week to aim for when the schedule allows it.

‍ ‍Ready to figure out what your strength training should actually look like?

If you are trying to work out how to fit S&C into your specific training week without it costing you on the road, that is exactly the kind of thing a run coach helps you sort out. Every athlete at Evolve gets a program built around their running volume, their training phase and their injury history, because the right answer for a 35 kilometre per week half marathon runner is not the same as the right answer for someone building toward an Ironman. Head to the run coaching page to find out more, or take a look at the strength and conditioning page if you want to understand how we approach the gym side of things.