This looks like a great 30 day crunch challenge. It calls for you to start with 20 regular crunches, on day1, and to increase those crunches by 5 every day. You will rest on the 4 day and resume on day 5, by then increasing the amount of crunches by 5 for the rest day and 5 for day of resume, giving you a 10 crunch increase on the resume day. This one is great because it is designed with a rest day after three days of duration. You can also check out other 30 day challenges, here.
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