On the July 13th broadcast of SBS's 'One Night TV Entertainment', ZE:A revealed their diet for better vocals, mentioning that Michael Jackson was also known to follow the same procedures. ZE:A loses 4 kg each month, which they revealed was also good for their vocals. They ran 5.7 km on the park trails in addition to climbing 558 stairs for 3 hours, a good exercise in strengthening their vocal muscles and breathing. After that, they trained their abdominal breathing, by exhaling for 4 seconds before holding their breath for another 4  seconds, after which they then blew a balloon for 4 seconds. They concluded their exercise by eating honey, which they revealed was good for their health. Dongjun recommended their diet as he stated, "While it's exercise, it's also good for both abdominal breathing and abs workout. Because we combine aerobics together with our diet, our lower body muscles are good." Source+Photo: Newsen via Nate