Answer :

Final answer:

Self-retracting lifelines with rest platforms every 150 feet or less ensure safety and prevent fatigue for workers at heights.

Explanation:

Self-retracting lifelines with rest platforms every 150 feet or less serve the purpose of providing a safe working environment for individuals working at heights. These lifelines allow workers to have a secure connection to a structure while also incorporating rest platforms to prevent fatigue during long climbs. The example provided of a springboard jumper maintaining a straight line posture to minimize splashes upon hitting the water emphasizes the importance of proper positioning for safety.

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