​If you're short on time, these five exercises are key to sculpting a flat belly.

I hear it often: “I just don’t have time to workout.” But that's not true! We all have time to squeeze in exercise, no matter how busy the day.

With this no-excuses core workout, you can tone up anytime and anywhere in just five minutes. Do each of the following five exercises for one minute, and then you're done! For best results, perform the circuit at least three times a week. (See? Easy.)

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