100 days workout challenge

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100 day ab challenge

Flat abs challenge | Focus on improving your abs with this 100 day ab workout. There are 5 exercises which between them will work all of the ab muscles, for a flat, trained look. You’ll get up to 90 reps a day by the end of the challenge, but you’ll work up to it gradually, increasing your strength and endurance as you go along. Includes free printable workout chart.

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