Abstract: An oro-facial exerciser apparatus for exercising and training the muscles of the lips and cheeks of a user's face, utilizes a pair of legs that are pivotally connected together to pivot between a substantially closed together state and a splayed apart state. The legs each have a proximal end proximate the pivot and a distal end remote from the pivot having a mouth mounting formation to mount the distal end to a respective opposing location of the user's mouth and the exerciser further has a resilient biasing means between the legs to bias them towards a splayed state and thereby provide a resistance force against which the user's lips and/or cheeks press in use for exercising and training the muscles. The resilient biasing means are demountably mounted on the legs, enabling them to be replaced with an alternative biasing means for altering the resistance.