The way it works is like this...
The pedalow has two seats in it, both with a set of pedals. The pedalow also has a display showing how many revolutions are being done a minute - this is on the front, so the pedalers cannot see it
So at all times, the task requires 3 people, two in the seats pedaling, and one person watching the dial making sure they stay above 60rpm.
They can't stop for a while and get off

They will have to make shifts for all 72 hours.... If they fall below 60rpm they fail!
The group were concerned before as they said when they change shifts it will most likely fall below 60rpm - so Jon went and asked Big Brother, and BB said they would make allowances for this.
They have bet 52% on their task, I think I heard Anouska say...
There was also a mention of Helen

Sissy and Ray were talking about how strict Big Brother would be if they dropped below the limit... and SIssy said
Sissy: Wasn't it like that in the other one, they failed...
Jon: yeah
Sissy: Yeah, Helen went to show the others her dress
The group are practcing at the moment, and they are finding 60rpm easy to keep.... but will they find it easy 4am in the morning

- Mark