Trust your base. I don't mean the 'bass', and treble.
Your base is your foundation. In endurance sports, your base is your 'aerobic base'. It is one of the main engines that drives your ability to 'go far and long'. Yet, the aerobic engine is shrouded in misnomers and confusion.
To build your aerobic engine, let's review the mathematics of heart-rate. Using Phil Maffetone's approach: 180 minus AGE is your Maximum Heart Rate. Never exceed this, when building your aerobic foundation. Even if you have to slow down, and walk, keep committed to this heart-rate limit. Once your heart-rate falls at the same intensity of work, you can then step it a notch higher. The main goal and intention is to teach your body to be more effective in using fat as a main source of fuel. Today, the popular term is applying the ketone-diet. You can train on an empty stomach, or breakfast-free. I use Bullet Coffee (with coconut oil) to run up to 2 hours or ride up to three hours.
Your aerobic base will buoy your anaerobic system, or higher-intensity workouts. It will also relieve stress on your body, reducing the chance of injuries, sleep better, and recovery faster.
Leadership Lessons: Return to basics. Maintain 'Beginner's Mind'. Learning and re-learning can be useful, whether you are a specialist, expert, consultant, teacher or champion. There is something to be gleaned from each experience, perspective and result.