Hit the Deck is a simple game that uses a timer and cards: Set the timer, draw your first card, and do as many repetitions as you can. When the timer beeps, draw your next card.
The length of your workout will be determined by how many cards you perform and the duration you set on the programmable interval timer. If you are short on time, keep it quick and only choose a few cards. If you've got more time, select more cards and even repeat the cycle over as many times as you can take it!
Simple, but actually looks quite fun.