A Trainer Gets Brutally Honest About Why You Aren't Seeing Results
If you have five minutes and a place to plank, you have the time and the space to work on your six-pack. These five exercises tone and strengthen all four layers of abdominal muscle to create a strong and sculpted core.
Directions: Perform each exercise for one minute. Keep your movements slow and controlled to maintain good form for all your reps.
Source: Pop Sugar
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