Each week, I ask a question about a common running science myth. Answer correctly and you'll be entered into the weekly raffle.
Research comparing one long "threshold-style" interval session vs the same work split into two sessions (AM/PM) shows the main advantage of a double-threshold day is what?
A. Lower HR/lactate/RPE drift per session, letting you accumulate more weekly “controlled” threshold volume 🧪📉 (42.5%)
B. Higher VO₂max stimulus, because two sessions give you two chances to hit max oxygen uptake 🫁⚡ (18.4%)
C. Better glycogen-depletion signaling, because the second session is always “train low” 🧠🍤 (17.2%)
D. A bigger total stress response, because frequency matters more than duration for endurance adaptation 🔥🔁 (21.8%)
Why this is right
The whole point of the double-threshold model (Ingebrigtsen style) is staying well below the lactate cliff on both sessions. Splitting the work keeps intensity controlled, which lets you accumulate far more total time at threshold per week than one longer, harder session ever would.
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