A weight plate may be provided with an inner face configured for mounting on the outer surface of a bar and a securing mechanism arranged adjacent the inner face for selectively securing and unsecuring the weight plate relative to the bar. The securing mechanism may be capable of being locked in a secured condition with the weight plate secured to the bar and being locked in an unsecured condition with the weight plate unsecured from the bar. A control apparatus for the securing mechanism may be operable to switch the securing mechanism between the secured and unsecured conditions, and may include a trigger operable, with the securing mechanism in the unsecured condition, to switch the securing mechanism to be locked in the secured condition, and a handle operable, with the securing mechanism in the secured condition to switch the securing mechanism to be locked in the unsecured condition.