The best replacement for 21 day fix is t25.

The best alternatives to 21 day fix are rated as following:
★★★★★  t25
★★★  p90x3
★  focus t25
★  ultimate reset

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Speaking about 21 day fix, one probably shouldn't forget about shakeology.

Other search terms related to 21 day fix and their ratings are:
★★★★★ shakeology
★★ p90x3
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21 day fix
t25
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