I am a huge fan of changing up the format of your workouts: intervals, as many rounds as possible (AMRAP) in a set time, superset strength training workouts, tabata workouts, etc. I designed this workout with the hope that it would change up your routine.
You will be doing strength or cardio movements followed by an isometric hold. Complete 10 reps of the indicated exercise and hold the position for 10 seconds. For example, if you are doing squat jumps, after completing 10 jumps, you will hold the squat position for 10 seconds. Complete 3 sets before moving to the next exercise.
An isometric exercise is when the length of the muscle remains the same for the duration of an exercise - you aren't lengthening it or shortening it. For example, holding the squat position or a plank position. Adding in isometric holds increases your strength and helps change up the format of your workout. As an added bonus, you feel a little extra burn when doing the exercise!