Treadmill workday: 13+ miles indoors with a sharper middle

The story of the day

Midweek went indoors — and it went long enough to matter. Matthew Brunken split the day into three treadmill sessions that added up to roughly 13.2 miles, bookended by easier spins and anchored by a substantial middle chunk: 9.5 miles in just under an hour at about 6:17 per mile.

Labels on the watch can say "easy" while the middle segment clearly carried more intent. That pattern is common in real training weeks: logistics push you onto the belt, and you still need a stimulus that serves December.

Reading the split day

1. ~1.0 mi @ 9:23/mi — opener / activation
2. ~9.5 mi @ 6:17/mi — the work
3. ~2.7 mi @ 7:26/mi — closer that still stayed honest

For a marathon build aimed at CIM, continuous outdoor long runs remain irreplaceable. For a busy weekday, fragmented treadmill volume with one sharper block keeps aerobic machinery online and quietly supports the Garmin Kansas City Half later in the season — a race that rewards the ability to hold a firmer rhythm when legs are already warm.

Why treadmill still earns a diary page

Search engines and athletes both overvalue scenic long runs and undervalue the Tuesday that happened between meetings. Publishing the indoor day does two jobs:

• It keeps Matthew Brunken's public training narrative continuous
• It tells the truth about how endurance seasons are actually built

Coaching takeaway

If your week requires a belt, design the middle — not just the total. A flat 13 at one gray pace is fine; a structured 13 with a purposeful center often transfers better toward half and full marathon goals.

Looking ahead

After a quality-tilted treadmill day, the next outdoor easy run should feel like permission, not punishment. CIM is still months out; the job now is stacking trainable days without turning every session into a referendum on fitness.