An exercise device including at least one positionable component
configured to be positioned by a user. The exercise device includes a
frame to which a collar is mounted. The positionable component includes a
member that is slidably received within the collar and may be positioned
by sliding the member to a selected position. A locking assembly is
coupled to the collar and is operable to lock the member in a selected
position within the collar, to release the member from the locked
position, and when released, to allow the member to slide within the
collar. The locking assembly includes a cam pivotably mounted to the
collar and a cam follower assembly selectively biased by the cam against
a portion of the member disposed inside the collar. The locking assembly
also includes a pair of engagement members disposed inside the collar
opposite the cam against which the cam biases the member.