It's time to target your core and build solid strength in your center. The good news? You only need to know one basic exercise that we're pretty sure you've already mastered.

The plank. 

You'll start off with a traditional plank before moving on to three of its core-forging variations—the body saw plank, star plank, and side plank. While each different version of this longtime gym standard is designed to target specific areas of your stomach, all four together will have you feeling an intense muscle burn throughout your entire midsection. 


You'll do this workout as a circuit, meaning you'll complete each exercise consecutively without rest. Once you've finished all exercises, rest for 30 seconds. Repeat the entire circuit for 5 to 10 rounds.

Depending upon your ability, you may shorten or lengthen the rest period. You may also complete more or fewer rounds.

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