Day 15: Do 100 sit-ups before work

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While we're in the spirit of waking up early to exercise - today's challenge is 100 sit-ups!

Get those abs working while you're still on an empty stomach and feeling light. Make sure you're on a padded surface, like on of our natural yoga mats, so your back is comfortable and supported. Do 100 sit-ups, 5 sets of 20. bar1

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