'Infinite Challenge' members' secret practice has become this week's hot topic.

According to various sources, MBC 'Infinite Challenge' members were having a meeting at a basement of a building in Kangnam, Seoul regularly.

This meeting was for members to keep up their on-site experience fresh and for new episodes as MBC strike has extended indefinitely.

The practice area is away from main streets and is about 260m2 sizes which is large enough for dance practice and so on.

'Infinite Challenge' was stopped for 19 weeks since MBC labor union went on strike on January 28, and it has stayed at about 5% viewer ratings with reruns.