The latest episode showed the cast receiving weight training at the Taereung Training Center with other national athletes.
Chansung received praise after successfully completing a difficult training where he wrapped sand bags around his neck and withstood the weight for a certain amount of time.
The athletes who were helping him said, "He's like an athlete. He's really good. He's a singer right? He seems more like an athlete than a singer."
Meanwhile, Chansung cringed as he pushed through the whole three sets of abs training.
FeelDog also was praised for his athleticism and captured the viewers' attention by revealing his sculpted abs after finishing his workout.