Don't need normal therapy? what are you jibbering on about. Speech therapy is far better than the methods you propose. You sound like one of those terrible life coaches conning peoe to buy your course. Exercise can help, although team sports, swimming and running will do better than just lifting. Groom yourself will hardly do any good. Actually see a speech therapist, try something like singing and acting classes, accept you have a stutter and no one else will care!