Purpose: Evaluate the ability of the mid body and core muscle groups to sustain isometric contractions against body weight resistance for an extended period of time or until failure.
Equipment: Exercise mat and stopwatch
Procedure: The participant lies face down on a mat resting on forearms and a portion of their palms flat on the floor in line with their elbows. He or she will flex their quadriceps, gluteal muscles, and core to raise the body up off the floor keeping their back parallel to the floor by flexing their entire core. At the end of the duration, instruct the participant to stop exercise by returning both knees to the floor. Record total time until form breaks.