미국 메릴랜드주 딥크리크의 훈련장에서 미국프로풋볼(NFL) 볼티모어 레이븐스 치어리더들이 공중곡예를 연습하고 있다. NFL의 치어리더들은 정규시즌이 열리기 전 몇 일에 걸쳐 돌연사 방지 집중훈련을 받는다. 이들의 훈련모습은 지난 5월 20일 촬영됐다. [메릴랜드=로이터연합뉴스]

<YONHAP PHOTO-0225> ATTENTION EDITORS - IMAGE 28 OF 40 OF PACKAGE 'RAVENS RULE THE SKIES'. SEARCH 'BALTIMORE RAVENS' FOR ALL IMAGES Baltimore Ravens cheerleaders perform stunts during cheerleader training camp at Deep Creek, Maryland, May 20, 2011. Cheerleader talent is strong along the east coast and candidates drive to Baltimore for team tryouts each March hoping to join the squad. Hundreds of competitors face three intense days of sudden-death eliminations against returning team members expecting to make the squad. Picture taken May 20, 2011. REUTERS/Jason Reed (UNITED STATES - Tags: SPORT)/2011-11-24 02:28:18/ <저작권자 ⓒ 1980-2011 ㈜연합뉴스. 무단 전재 재배포 금지.>\r\n<YONHAP PHOTO-0225> ATTENTION EDITORS - IMAGE 28 OF 40 OF PACKAGE 'RAVENS RULE THE SKIES'. SEARCH 'BALTIMORE RAVENS' FOR ALL IMAGES Baltimore Ravens cheerleaders perform stunts during cheerleader training camp at Deep Creek, Maryland, May 20, 2011. Cheerleader talent is strong along the east coast and candidates drive to Baltimore for team tryouts each March hoping to join the squad. Hundreds of competitors face three intense days of sudden-death eliminations against returning team members expecting to make the squad. Picture taken May 20, 2011. REUTERS/Jason Reed (UNITED STATES - Tags: SPORT)/2011-11-24 02:28:18/ <저작권자 ⓒ 1980-2011 ㈜연합뉴스. 무단 전재 재배포 금지.>
ATTENTION EDITORS - IMAGE 28 OF 40 OF PACKAGE 'RAVENS RULE THE SKIES'. SEARCH 'BALTIMORE RAVENS' FOR ALL IMAGES Baltimore Ravens cheerleaders perform stunts during cheerleader training camp at Deep Creek, Maryland, May 20, 2011. Cheerleader talent is strong along the east coast and candidates drive to Baltimore for team tryouts each March hoping to join the squad. Hundreds of competitors face three intense days of sudden-death eliminations against returning team members expecting to make the squad. Picture taken May 20, 2011. REUTERS/Jason Reed (UNITED STATES - Tags: SPORT)/2011-11-24 02:28:18/ <저작권자 ⓒ 1980-2011 ㈜연합뉴스. 무단 전재 재배포 금지.>\r\n ATTENTION EDITORS - IMAGE 28 OF 40 OF PACKAGE 'RAVENS RULE THE SKIES'. SEARCH 'BALTIMORE RAVENS' FOR ALL IMAGES Baltimore Ravens cheerleaders perform stunts during cheerleader training camp at Deep Creek, Maryland, May 20, 2011. Cheerleader talent is strong along the east coast and candidates drive to Baltimore for team tryouts each March hoping to join the squad. Hundreds of competitors face three intense days of sudden-death eliminations against returning team members expecting to make the squad. Picture taken May 20, 2011. REUTERS/Jason Reed (UNITED STATES - Tags: SPORT)/2011-11-24 02:28:18/ <저작권자 ⓒ 1980-2011 ㈜연합뉴스. 무단 전재 재배포 금지.>