My husband and I are looking at this system as a way to exercise together. I found this while reading about it:
(while sitting on the 'balance board' that is one of the many accessories)

Objective: Sit perfectly still and don't disrupt the candle!
# How to Unlock: Accumulate 3:00 Fit minutes Sit on the Balance Board cross-legged and don't move a muscle. Any twitch you make will cause air to rush over the candle, potentially putting it out!