The best replacement for p90x3 is t25.

The best alternatives to p90x3 are rated as following:
★★★★★  t25
★★★★  body beast
★★★  p90x
★★★  focus t25
★★★  insanity
★★★  p90x2
★★  21 day fix
★★  rushfit
★★  body revolution
★★  insanity asylum
★★  gym
★★  ufc fit
★  t25 gamma
★  chalean extreme
★  asylum
★  les mills pump
★  t25 reviews
  athlean x
  t25 workout
  jillian michaels
  10 minute trainer

Your alternative for p90x3 is not listed? Suggest!
Speaking about p90x3, one probably shouldn't forget about shakeology.

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