Overtraining Kills More BQ Attempts Than Undertraining

Ask any endurance coach what derails Boston qualifier attempts most often, and the answer won't be a lack of talent. It won't be bad weather on race day. It won't even be injury in most cases — injury is usually the downstream symptom. The real culprit is overtraining.

Why fit athletes overtrain

It's a paradox. As an athlete gets fitter, they can absorb more volume. Workouts that used to hurt now feel easy. The natural response is to add more — more miles, more intensity, more "just one more" sessions. And for a while, it works. Then it stops working. Sometimes it stops working loudly, with a stress fracture or an overtraining syndrome diagnosis. More often, it stops working quietly — a flat race, a lost peak, a six-month rebuild.

Adaptation does not happen during the workout. It happens during recovery. If recovery never finishes, adaptation never consolidates. You're just taxing the same system over and over with nothing to show for it.

What I actually track

Coaches track effort. Power numbers, paces, CTL, TSS, HR zones. All useful. I track what's happening underneath the effort.

Baseline labs and how they drift over a block. Markers of inflammation. Hormonal patterns (testosterone, cortisol, thyroid) and whether they're holding, drifting, or crashing. Sleep metrics — not just duration but deep sleep architecture and heart rate variability trends. Resting heart rate baseline changes. Subjective mood and energy patterns, because those are often the earliest signal.

Any one of these, on any one day, doesn't mean much. The pattern across weeks is what matters. When the pattern says "push," we push. When it says "protect," we protect — regardless of whether the athlete feels like backing off.

Where we are in John's arc

Right now, the signals are clean. His markers are moving in the direction that says the training is being absorbed rather than accumulating as damage. That's a green light to continue building.

But as we approach the qualifying window, the job shifts. The focus stops being about building John up and starts being about making sure he arrives at the start line healthy, rested, and ready. The last four to six weeks before a goal race are when the temptation to "squeeze in one more hard effort" is highest and the cost of doing it is also highest. That's where my job gets loud.

The mental reframe

If you're training for anything serious, stop thinking about training as the thing that makes you faster. Training is the stimulus. Recovery is the thing that makes you faster. The stimulus is free — any motivated athlete can give themselves more of it. Recovery is the constraint. Manage the constraint and the rest of the plan works. Ignore it and no plan works.

Coaches track effort. Someone has to track what's happening underneath.

— Dr. Alec Weir