051918 Lifeguard Training (MA)

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Emma Hryniewicz of Crystal Lake, 17, holds a mannequin used for CPR training as she and fellow lifeguards finish up their lifeguard training for the day at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Rachel Jost of Algonquin, 18, practices CPR on a mannequin for lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Crystal Lake Parks District Recreation and Aquatics Supervisor Jessica Ortega (back) watches as Emma Hryniewicz of Crystal Lake, 17, practices CPR on a mannequin during their lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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David Tulke of Crystal Lake, 19, checks for a pulse during lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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David Tulke (front), 19, and Emma Hryniewicz, 17, both of Crystal Lake, practice CPR on mannequins for lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26. This summer will be Tulke's third season and Hryniewicz's second season as lifeguards at Main Beach.

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Crystal Lake Parks District Recreation and Aquatics Supervisor Jessica Ortega points out directions for CPR training for her lifeguards at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Rachel Jost of Algonquin (right), 18, and Emma Hryniewicz of Crystal Lake, 17, pick out their lifeguard apparell for their summer work at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Joshua Antongionvani (left), 18, and David Tulke, 19, both of Crystal Lake share a laugh during lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Joshua Antongionvani of Crystal Lake, 18, practices CPR on a mannequin during lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Crystal Lake Parks District Recreation and Aquatics Supervisor Jessica Ortega demonstrates CPR on a mannequin for her lifeguards at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Lifeguards tour the new boat house with Crystal Lake Parks District Recreation and Aquatics Supervisor Jessica Ortega (right) after their lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.

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Emma Hryniewicz, 17, and David Tulke, 19, both of Crystal Lake, practice CPR on mannequins for lifeguard training at Main Beach on Saturday, May 19, 2018 in Crystal Lake. Main beach will open next weekend, on Saturday, May 26.