The American College of Sports Medicine (ACSM) is the sports-medicine professional body whose position stands — on fluid replacement, exercise prescription and more — are cited throughout this site's references.
ACSM's public certification listings describe the ACSM Certified Personal Trainer (ACSM-CPT) as an NCCA-accredited credential requiring a proctored exam, adult CPR/AED certification and a high-school diploma at minimum, with recertification through continuing education. ACSM also lists clinical-track credentials (Certified Clinical Exercise Physiologist) for professionals working with medical populations. ACSM operates a public verification tool (ProFinder) where anyone can check whether a named trainer currently holds an ACSM credential.