What is Banking Time?

Banking Time is the practice of running "ahead of schedule" in the early miles of a marathon or long race. The logic is: "I know I'll slow down later, so I should get some extra minutes in the bank while I feel fresh."

Why It's Usually a Trap

For 99% of runners, banking time leads to a disastrous positive split.

The Glycogen Tax

Running even 10-15 seconds per mile faster than your optimal pace burns glycogen exponentially faster. You "save" 2 minutes in the first half but "spend" 10-20 minutes in the second half because you hit The Wall earlier and harder.

Physiological Stress

Faster running increases heart rate and body temperature earlier in the race, leading to premature fatigue and gastrointestinal issues.

When Is It Okay? (Rare Cases)

• Course Profile: If the first half is steeply downhill and the second half is uphill (e.g., Boston Marathon to some extent), you will naturally "bank" some time, but this should be due to effort control, not intentional sprinting.
• Wind: If you have a massive tailwind that is predicted to become a headwind.

The Better Alternative

Even Splits or a slight Negative Split is almost always the faster way to finish. Trust your training and stay patient.

You can't bank time in a marathon. You can only borrow it, and the interest rate is 500%.