This game can be a little boisterous.
All but one person line up at one end of the room, with the remaining person in the middle.
Everyone, including the one in the middle, folds their arms and stands on one leg.
When the whistle goes everyone hops to the other end with the person in the middle ‘barging’ them as they pass. If they put both feet down or undo their arms they are ‘caught’.
Once caught, they join in the middle helping to catch others until everyone is caught.
Note: Leaders should ensure the people on the middle also obey the hopping/arms rules.