alishaalisha The (15-Minute) Belly Blasting Workout- for the underworked lower abdominal muscles
nadianadia 6 Easy Exercises to Strengthen Your Core|Tone your core with a 15-minute workout, three or four times a week.
chasitychasity Say it with us: No more crunches! You can do this 15-minute #abs #workout standing up!

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