The Best Time to Build Strength Isn't Junior Year. It's Right Now, in 8th Through 10th Grade.

By Coach Justin Roeder

Here's a pattern I've seen play out more times than I can count. A runner spends middle school and freshman year running on talent and enthusiasm alone. Then junior year hits, mileage jumps to keep up with what varsity actually demands, and suddenly an athlete who never had an issue before is dealing with shin splints, a stress reaction, or a hip that won't stop barking. The mileage gets blamed. The mileage isn't really the problem. The problem is that nobody built the foundation underneath it years earlier, back when there was time to do it right.

If your runner is in 8th, 9th, or 10th grade right now, this is the window. Not junior year. Not after the first injury. Now.

Why this age range matters so much

A high school varsity distance runner is often logging 45 to 50 plus miles a week by junior or senior year. That's a massive jump from where most 8th and 9th graders are training. The body has to be able to absorb that kind of load, and the thing that determines whether it can isn't just aerobic fitness. It's whether the hips, glutes, ankles, and core can stabilize the body correctly through thousands of repetitive foot strikes.

Younger athletes are also dealing with growth spurts, changing limb proportions, and coordination that's still catching up to a body that's changing faster than they can adapt to it. That's exactly why this age group benefits so much from dedicated movement and strength work. It's not about adding intensity. It's about teaching a growing body how to move well before you start asking it to move a lot.

Skip this step, and a runner heads into the highest mileage years of their career with movement patterns that were never corrected. Address it now, and that same runner walks into junior year with a body that's actually built for what's coming.

Curious what age-appropriate strength work looks like for a runner this young? Take a look at the Strength and Mobility program here.

What building the foundation actually looks like

This isn't about loading up a 13 or 14 year old with heavy weights. At this age, the priority is movement quality. Single leg balance and control. Hip stability. Basic hinge and squat patterns done correctly before any load gets added. Ankle mobility, since a lot of the compensation patterns that cause injury later start with restricted ankles that nobody ever addressed. Core control that holds up under fatigue, not just when an athlete is fresh.

Layered on top of that is where the real payoff shows up down the road. Athletes who spend these years building genuine strength and mobility, rather than just logging easy miles, tend to handle the volume jump in junior and senior year without the same injury cliff so many of their teammates hit. They're not starting from zero when the mileage ramps up. They're building on a foundation that's already there.

This runs alongside a school program, not instead of it

I want to be clear about this part too. This kind of work complements whatever your athlete's middle school or high school coach already has them doing. It's not a second training plan competing for their attention. It's two focused strength sessions and two mobility sets a week, built specifically for a young distance runner and adjusted around whatever their season already looks like. Every exercise comes with a video demonstration, so there's no guesswork for a younger athlete still learning how their body moves.

If you want to see exactly what that looks like for an athlete this age, check out the full program here.

The parents who get ahead of this are glad they did

I talk to a lot of parents after the fact, once an injury has already cost their runner a season. I'd much rather have the conversation now, while your 8th, 9th, or 10th grader still has time to build the foundation before the mileage really starts climbing. It's a much easier problem to solve at 14 than it is to fix at 17 after two years of compensating around it.

If your middle schooler or younger high schooler is serious about running and you want them to walk into junior year strong instead of catching up from an injury, reach out through the Strength and Mobility page and let's talk about starting now, while it's still the easy problem to solve.