megarexia
n.— «Over-exercising…may also be due to other psychological disorders (e.g. obsessive-compulsive disorder), or to megarexia (also referred to as “bigarexia” or “muscle dysmorphia”). Megarexia is characterised by a constant preoccupation with body size and a rigid exercise routine, resulting in compulsive exercising and weight training even when injuries are present.» —“Dangers of Over-exercising” by Lynette Ng Pharmvision.com July19, 2001. (source: Double-Tongued Dictionary)
Further reading
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