Connect a resistance band to the workout bar and attach the other end to a D-ring on an ankle strap. Do the same for a pair of resistance bands. With feet flat beneath the bar squat down and grab the bar with shoulder width or slightly wider using an overhand or a mixed grip.
Lift the bar by extending hips and knees to full extension. Pull shoulders back at top of lift if rounded. Return by bending knees forward slightly while allowing hips to bend back behind, keeping back straight and knees pointed same direction as feet. Repeat.
Add difficulty by triple, or quadruple the resistance bands through the holes under the workout bar and the D-rings on the ankle straps.