Strength Training for Marathon Runners: What Actually Moves the Needle

I get asked about strength training more than almost anything else by the marathoners I coach, and the honest answer is that most runners are either doing none of it or doing the wrong version of it at the wrong time. Neither one is helping you.

Here's what I actually want to see from the adult runners I coach, broken down by where you are in your training cycle. If you don't have a specific goal pace dialed in yet to build any of this around, grab my free race and training pace calculatorfirst so the rest of this actually has a target.

Early in the build, this is where real strength gets built. When you're twelve to sixteen weeks out, which is exactly where a lot of you are right now heading into a fall race, this is the window for genuine strength work. Heavier weight, lower reps, two sessions a week. Squats, deadlifts, single-leg work, and core. This is not the time to be precious about it, your legs can absorb real strength training now because the running volume hasn't peaked yet.

As mileage climbs, the goal shifts from building to maintaining. Once you're six to twelve weeks out and your weekly mileage is climbing toward peak, I have athletes drop to moderate weight and moderate reps. The goal isn't to keep getting stronger at this point, it's to hold onto the strength you already built without adding fatigue that bleeds into your key running workouts. This is where I see runners most often get it wrong, they keep lifting like it's July when their body actually needs the recovery capacity for marathon-pace work. This exact kind of week-by-week adjustment is what I build into my Performance and Elite coaching tiers, so nobody has to guess when to back off.

Taper is not the time to prove anything. In the final two to three weeks, strength training should shrink to one short, light session, and then stop entirely five to seven days out. I promise you, no amount of squats in taper week is going to help your marathon. Rest will.

Timing within the week matters as much as the plan itself. Never schedule a heavy lower-body session the day before a long run, a marathon-pace workout, or a hard interval day. I'd rather see an athlete lift the same day as an easy run, or on a full rest day, than have them show up to their most important workout of the week with tired legs from the gym. If you'd rather have this mapped out for you week to week instead of juggling it yourself, my structured training plans already build the sequencing in.

The runners I've coached to a Boston Qualifying time almost never got there by adding more miles alone. The ones who stayed healthy enough to actually execute their full training block were usually the ones who treated strength training as part of the plan, not an afterthought squeezed in when they had extra energy. You can read what that's looked like for real athletes I've coached on my testimonials page.

If you're building toward a fall goal race and want a plan that actually integrates strength work with your running instead of treating them as two separate things, that's exactly what I build for the runners I coach. Learn more about adult distance running coaching, or reach out for a free 15-minute consultation and let's talk about where you're starting from.