Ability to relax through mental training was investigated on 30 male subjects (age range 18 to 30 years). The subjects were divided into three groups (Aerobic, Anaerobic & Mixed), based on their game/event, and the energy system that primarily caters to their metabolic requirements. It was found that aerobic group of subjects exhibited greater ability than all other groups to relax with the progression of mental training programme as indicated by the appearance of significant reduction in minute Heart Rate at all corresponding stages of the sessions from the start to the end of mental training programme (MTP).