Final answer:
The man lifting a growing bull each day demonstrated the principles of progressive overload and consistency, which are essential for effective muscle strength and endurance conditioning.
Step-by-step explanation:
The man who lifted a new-born bull on his shoulders each day until it was fully matured followed two principles of modern muscle strength and endurance conditioning. The first principle is progressive overload, which necessitates the gradual increase of stress placed on the body during exercise. As the bull grew and became heavier, the weight he lifted each day also increased, which is a fundamental concept in building muscle strength. The second principle is consistency, as he performed this task regularly over time, contributing to the gradual improvement of muscular endurance. Both principles are crucial for long-term strength training and conditioning, ensuring continuous adaptation and growth of the muscles.