NASM’s Personal Trainer Certification (NASM-CPT) is a certification, which means you must recertify every two years.
On the contrary, the Corrective Exercise Specialization (NASM-CES) is and Performance Enhancement Specialization (NASM-PES) are specializations, not certifications, which means they do not need to be renewed. Once you pass your CES and PES final exams, your NASM-CES and NASM-PES specialization certificates never expire.