Players: 2-6 players
Goal: To get rid of all the cards in your hand
The game is played according to the standard rules of bullshit. There are several variations, but this is our favorite:
The deck is shuffled, and all the cards are dealt to the players. If there are only 2 players, removed a few cards first so that each player cannot figure out what their opponent has by simply looking at what cards are missing from their own hand. The wild card can become any card desired by the person holding it. A player is chosen to go first.
Cards are played in order: Ace, two, three, four...Jack, Queen, King. So the first player must play at least one card and claim that it is an ace by removing the card from their hand, placing it face down on the table, and declaring "one ace." Players can play one card or as many cards as they want, but they must declare the number of cards they are playing, and they must claim that the cards are the card being played (so aces for the first player, twos for the 2nd player, threes for the 3rd player, and so on).
Bullshit is all about lying and trying to get away with it. So a player could play 2 cards claiming they are both aces, but in fact they are not. Or a player could play 3 cards, but claim they played only 2 cards. The goal is to get rid of your cards, and lying helps you do it faster.
If any player suspects another player lied after they played their cards, they call "Bullshit" (or "I doubt it for a G rated game). The played cards are then turned over. If the cards are in fact what they were declared, the player who called bullshit must pick up all the cards that have been played. If the cards were not what they were declared, the player who played them must pick up all the cards on the table.
If no one calls bullshit, the cards stay face down on the table, and the next player must play at least one card of the next sequence (so if aces were just played, he/she must now play twos).
Where Stack 52 Bullshit differs from standard Bullshit, is that in addition to picking up the cards when a player gets caught lying (or wrongly accuses their opponent of lying), they must perform the exercises on the cards. Depending on the fitness level of the players, you may choose:
Advanced: The player does a maximum of 8 of the cards he/she picks up.
Intermediate: The player does a maximum of 5 of the cards he/she picks up.
Beginner: The player does a maximum of 3 of the cards he/she picks up.
Team Work: The players divide up the exercises on the picked up cards and do them as a team effort. The player that correctly called bullshit or was wrongly accused can elect to give his/her cards to the offending player who must do both.