Final answer:
Vertical loading is seen during Phase 4: Maximal Strength in the training process.
Step-by-step explanation:
Vertical loading is seen during Phase 4: Maximal Strength in the training process. This is the phase where the focus is on lifting the heaviest weights possible, which require the body to exert force against gravity in a vertical direction. Examples of exercises that involve vertical loading include squats, deadlifts, and overhead presses.