Running more isn't enough: why you're missing the weights room

There's an old and stubbornly popular fear among recreational runners: that the gym will leave you heavy, slow and lumbered with wardrobe-sized legs. We've been hearing it on group runs for years. The bad news for that fear is that the evidence points firmly in the opposite direction, and it comes with numbers attached.

What actually improves

As reported by Infobae, a study published in the British Journal of Sports Medicine shows that planned strength training improves running economy and resistance to fatigue in endurance athletes.

Running economy is essentially how much energy a given pace costs you. Improving it means the 5:30 per kilometre that leaves you gasping today becomes slightly cheaper tomorrow. You don't run differently, you run at a lower cost. And fatigue resistance is what decides whether kilometre 18 is something you manage or something you endure.

The research also links muscular work to a lower incidence of injury, which for a recreational runner is probably the clinching argument. The best session of the year is the one you don't miss because of tendinitis.

The difference between doing strength and doing strength

Here's the small print, and it's the part almost nobody mentions. The coaches consulted don't talk about getting to the gym when you can. They talk about blocks of at least eight weeks, with two sessions a week and loads ranging between 40% and 85% of your maximum.

Those three figures change everything. Eight weeks, because adaptations need time and a month gets you nowhere. Two sessions, because one doesn't provide enough stimulus and three tend to collide with your long runs. And that load range, because it means at some point you have to lift properly, not do three sets of squats with an empty bar while checking your phone.

Two well-planned strength days beat five improvised ones. Planning isn't bureaucracy: it's what turns effort into adaptation.

The core idea of the study

The mistakes we see every time

The first is squeezing strength in the day before the long run and arriving on Sunday with legs made of concrete. The second is never progressing the load: if you're lifting the same in week eight as in week one, you've done PE, not training. And the third, the most human of all, is quitting in week three because nothing seems to be happening. Of course nothing is happening yet, the adaptations you're after show up considerably later.

Where it fits in your week

If you run three days a week, the simplest arrangement is strength on two of those same days, after the easy run, keeping the long-run day and the one after it clear. It sounds like a lot, but we're talking about two forty-minute sessions. Roughly the time that disappears into your third consecutive episode of something on telly.