I would start with loving yourself and your body. Whenever you catch yourself critisizing yourself, change it with appreciating your positive aspects. When you come close to the mirror, intend to find some nice things about yourself. When you do that consistantly, you will be inspired to workout instead of trying to push through. Our bodies naturally love to move. But when you dislike your body, it does, what you tell - resists anything that keeps it healthy and beautiful.