OFM: The Golden Window

The Golden Window is an important and innovative threshold in OFM Aerobic Base Training. Achieving the Golden Window endows the athlete with the ability to metabolize fat at high rates and high intensities of effort required to achieve your health & performance potential.

Over the course of the OFM base phase of training a key goal for any athlete is to reach the first level of the “Golden Window” of 2 hours of steady state aerobic exercise or physical activity at a moderate effort level without requiring any exogenous calories and with stable energy levels. After the athlete should not be ravenous nor depleted. This is a VERY achievable goal for most people and, in combination with the Metabolic Reset this places the individual in a superior metabolic state.

The time it takes to build up to this level of aerobic fitness can take as little as 2 weeks or as long as 6 weeks time and can be started after the initial phase of the Metabolic Reset. This time line depends principally on the athletes level of fitness and degree of fat adaptation. The athlete should not attempt this during the initiation week of the Metabolic Reset (week 2) when they are struggling with their energy levels, however, they should be able to start to work towards The Golden Window by the third week.

This should be accomplished with the sport or activity of choice and will be part of your first block of aerobic base training after making the initial shift during the Metabolic Reset.

Once an athlete works up to this window their body will burn mostly fat every time they exercise provided they do a “Long Slow Warmup”. To maintain this level of conditioning we recommend at least one 2 hour+ aerobic training session every 7-10 days.

We recommend starting with 2-3 weeks of aerobic base training working up to 120 minutes of steady state physical activity. If you use a Heart Rate monitor use the Modified Maffetone Method (200 BPM-Age +/- variables) to determine your “Fat Max” HR for these base workouts and do not exceed.

Thereafter, depending upon one’s condition, in the next 3-4 weeks incorporate 1-3 workouts which are high intensity intervals (HIIT), or tempo training after the LSW and followed by a cooldown. The process is LSW of 30 minutes, 15-30 minutes of the ‘work’ segment of the workout whether it is HIIT, tempo or hills. On these workouts you will be pushing your HR during the higher intensity portions of your workouts. Be sure to get adequate rest/recovery/adaptation. These workouts will allow you to push not only your endurance envelope but your performance envelope by expanding your fat burning aerobic envelope into higher intensity levels.

As you improve in fitness the next level of "The Golden Window" is to achieve 4-5 hours of continuous physical activity. Depending upon your goals it can be training in your sport(s) or a combination of continuous physical activities. Often we suggest athletes do their long 2+ hour training then immediately combine it with a physical activity like house cleaning or yard work or hiking/biking/playing with their family in an activity that requires continuous physical output.

Consume a pouch of VESPA 30-45 minutes prior to accelerate the process and speed recovery. If you are moving to the 2nd level of "The Golden Window" beyond 2.5 hours take another VESPA either halfway through or every 2-2.5 hours after starting exercise. Maintain adequate Hydration. Always take the time to warm up instead of going hard from the beginning of your exercise.

Getting to the Golden Window

You must be logged in to access this course

Welcome and Overview

Week 1: Preparation

Module 1: Introduction

Module 2 : Assessment

Module 3: Cleaning up the Diet

Module 4: Identifying and Mitigating Stressors

Module 5: Supplemental Reading

Week 2 : Initiation

Module 1: Pre-Flight Checklist

Module 2: MR Takeoff Time!

Module 3: Eating and Hydrating

Module 4: Nutrition and Supplementation

Module 5: Using Vespa During the MR

Module 6: Lifestyle and Training During MR

Week 3: Stabilization

Module 1: Stabilization Overview

Module 2: Diet and Supplementation Review and Tweaking

Module 3: Training

Module 4: Lifestyle Review

Module 5: Identifying Underlying Issues

Module 6: Training - Supplemental Material

Module 7: Identifying Underlying Issues - Supplemental Material

Module 8: Lifestyle Supplemental Material

Week 4: Transition to Adaptation Phase

Module 1: Stabilization, Review & Transition to Adaptation Phase

Module 2: Training

Module 3: Nutrition and Supplements

2026 Live Calls and Replays

2025 Live Call Replays