The best replacement for nsca is nasm.

The best alternatives to nsca are rated as following:
★★★★★  nasm
★★★★★  acsm
★★  issa
★★  cscs
★★  nasm certification
★  ace certification
★  uksca
★  nesta
★  ncsf
★  nrpe
★  cscca
  afaa
  mike boyle

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