Final answer:
Glen must have a high degree of dynamic strength to climb telephone poles all day without becoming overly fatigued, as it involves repeated muscle contractions.
Step-by-step explanation:
Glen, a utility line worker who is required to climb telephone poles regularly, must possess a high degree of dynamic strength. Dynamic strength is the ability of muscles to exert force repeatedly over time, which enables Glen to climb up and down without becoming overly fatigued. This type of strength allows for the repeated contraction and relaxation of muscles necessary for activities such as climbing. Static strength, by contrast, is the ability to exert force against a resistance without movement, which isn't as relevant in the context of climbing poles where movement is continuous.