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. Grab the workout bar shoulder width apart using an underhand grip.
With elbows to side, raise bar until forearms are vertical. Lower until arms and repeat.
When elbows are fully flexed,they can travel forward slightly allowing forearms to be no more than vertical. This additional movement allows for relative release of tension in muscles between repetitions.