Abstract: A lock assembly for use with an inversion apparatus includes a ratchet plate, a position lock pawl, and a safety lock pawl. The ratchet plate is operatively connected to a first tube portion and is accessible through a slot in a second tube portion of the inversion apparatus' securing assembly. The position lock pawl is pivotally connected to the second tube portion to selectively engage the ratchet plate through the slot. The safety lock pawl is pivotally connected to the second tube portion. The safety lock pawl does not engage the position lock pawl when the user support is in the loading position and is configured and arranged to pivot relative to the second tube portion as the user support moves from the loading position into the inverted position to engage the position lock pawl.