Deck of Cards
Take a full deck of cards that has 2 jokers. Work through the whole deck by fliping over the cards and performing the exercise that is associated with that card's suit. The number of reps is the face value of the card (Jack = 11 reps, Queens = 12 reps, Kings = 13 reps, Aces = 14 reps).
Hearts = Sit Ups
Diamonds = Sledge Hammer Swings
Spades = Kettle Bell Swings
Clubs = Squats
Jokers = 400m Run