Just finished 28 day and I loved it. You can combine as many workouts as you like. I combined, 90 day, 28 day and a 17 day. Definitely see changes quite quickly. I had an issue with my order and customer service sorted it quickly. I would say the board is a little cheap feeling and looking as it crunches when you stand on it. However, it seemed to hold up well so far. The only real issue I really have are the resistance band handels are a little uncomfortable.
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