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If you're looking for a way to spice up your workouts, consider doing a deck of cards workout. This workout literally leaves it up to chance to determine what exercises and how many reps you will be performing from one card to the next. Plus, you can play it alone or with a partner.

The gist of a deck of cards workout: You assign exercises to each suit, draw cards, and do the exercise associated with the suit of the card for the number of reps indicated by the card.

"The benefit of this workout is that it's completely random—you don't know what's coming next," explains Mat Forzaglia, a certified functional strength coach and instructor at NEOU Fitness. "This can help your cardio goals by keeping the pace going, and it can also help with strength by adding volume. And you can play it in many different ways, depending on your focus for the workout."