Final answer:
The best training method to improve a hockey player's energy system is High-intensity interval training (HIIT). option D.
Step-by-step explanation:
The best way to train to improve an energy system for a hockey player is d) High-intensity interval training (HIIT). This type of training involves short bursts of very intense activity followed by intervals of lower intensity or rest, and it aligns well with the demands of hockey, which requires players to exert maximum effort in short, intense periods of play. HIIT can enhance both aerobic and anaerobic fitness, contributing to endurance, strength, speed, and agility on the ice.
While endurance training is beneficial for the aerobic capacity and strength training is crucial for power, speed and agility training are important for quick directional changes and overall mobility. However, HIIT combines elements of these training methods and therefore offers the most comprehensive approach for a hockey player's energy systems development. Consistently incorporating HIIT into a training regimen can significantly improve a player's performance during games, where high intensity and quick recovery are key.