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5BX is AWESOME! I reached 6B a few years ago before switching to another program and was super, super fit. In 11 mins a day! Started again at chart 2 the other day, it is totally working and this time I'm going to 6A+ and staying there!
The situps and toe-touching can be unsafe if you round your back. To avoid this problem, always do it with a straight back (much more difficult but who wants a back injury). If you find any safe abs exercises that can be substituted easily, let me know!
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