A person lies supine on a floor surface with her knees bent and her feet resting on a foot supporting portion of an exercise assembly. The person uses her hands to grasp respective left and right handles on the exercise assembly proximate her left and right hips. The person positions her abdomen beneath a strap secured in series with at least one resistance device. The person moves her pelvis off the support surface subject to resistance from the resistance devices. Parts of the assembly may be used apart from the overall assembly to perform other sorts of exercises.