Short on time? Tabata training is a great way to get your heart rate up quickly and then recover. You will do each exercise for 20 seconds and then rest for 10 seconds. 32 Minute Full Body Tabata Workout #sponsored by Polar | He & She Eat Clean
Not a huge crossfit fan but this looks like a good way to get in an interesting workout... Could even switch up the moves and as you get more advanced double the reps of each card.