I wanted to find out how to get to Happy Sauna in ERod. That was my first experience with MTC.
Later on, I met the owner of Kuusamo Spa and I became a "frequent patron".
If we're talking pure aerobic endurance; Anti-Glycolitic Training works.
Variations include the Maffetone Method, Zone 2 Training, or special weightlifting programs with high bursts of energy followed by prolonged rest.