Unfortunately one of my competitors at Nationals had a heart attack and collapsed in the ballroom right after we finished dancing Quickstep. Several doctors who were in the ballroom frantically performed CPR on him and managed to revive him. He was rushed to the hospital. Hopefully he makes a full recovery. This is actually the second time I've seen a competitor have a heart attack in the ballroom. (That's why they make you sign a release waiver before permitting you to compete.) Some research on the physical effects of competitive ballroom ... University of Freiburg study in 1986: exertion and breathing rates of dancesport athletes performing a single dance were the same as cyclists, swimmers and 800m runners over the same two minute period. University of Oxford 1988: level of fitness of championship dancesport competitors is the same as Olympic decathletes; a dancer performing a two minute Viennese Waltz experiences the same exertion level as that experienced by an Olympic 100m hurdler. Peter Pover, former President US Dancesport Council stated that tests in Germany “found no significant athletic difference between running 800 metres and doing the quickstep for 1.5mins” Sports Illustrated 1995. Medical research has shown that dancesport is comparable with other sporting activities such as basketball, squash and cross country running with dancers performing at over 80% of their maximum oxygen consumption level and burning up at least 300 calories per hour (Blanksby & Reidy, 1988 British Journal of Sports Medicine, Vol 22, Issue 2, 57-60: Heart rate and estimated energy expenditure during ballroom dancing) Dancing used by a Mexican cardiologist Dr Hermes Ilarraza for heart disease patients. Patients did 30 minutes of dancing over five weeks for five days per week and increased their exercise capacity by about a third. New England Journal of Medicine in 2003 reported that elderly people who danced frequently had a 76% lower chance of developing dementia.