bottleneck-slow down or impede by creating an obstruction; His laziness has bottlenecked our efforts to reform the system. blockade, obstruct, stymie, stymy, embarrass, hinder, block-hinder or prevent the progress or accomplishment of; His brother blocked him at every turn.
Becoming a Lifeguard. Becoming a lifeguard does require an initial investment of time and money. Certification courses cost anywhere from $150 to $500, and take upwards of 30 hours to complete.
Lifeguards follow the 10/20 rule. Once a lifeguard notices a potential problem, they must respond in 10 seconds and be able to reach the person in 20 seconds, so it is absolutely necessary to be in shape and to be a strong swimmer.