The best replacement for issa is ace.

The best alternatives to issa are rated as following:
★★★★★  ace
★★★★★  nasm
★★★  acsm
★★  ace certification
★★  cummings
★★  nesta
★  nsca
★  afaa
★  ncsf
★  isaca
★  waxman
★  holder
  afpa
  precision nutrition
  ncsa
  masakazu imanari
  jerry tetalman
  ifpa
  canfitpro

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