Abstract: The present invention relates to an apparatus for enhancing isometric and/or isotonic exercises and methods of using same. In particular, the apparatus for enhancing isometric exercises includes a substantially rigid annular exercising assembly which is placed in a user's mouth and held in place by the user's lips and more particularly between the user's lips in such a manner that the user's upper and lower teeth are not in a substantially engaged position. The substantially rigid annular exercising assembly has an exterior and an interior wall which connect and thereby form a trough. The anterior, medial and posterior surfaces of the user's lips fit within the trough thereby providing the mechanism for holding the substantially rigid annular exercising assembly within the user's mouth during exercise. In this manner, the substantially rigid annular exercising assembly is essentially freestanding and does not require the user to grind their teeth, or tense or strain the jaw or Templar-Mandibular Joint.