If you had a 30-pound barbell at home and you wanted to compare your muscular endurance to your younger brother's, which method would be the BEST to use?
They time how long each can hold it up above their heads for, then compare the times. The longest time has the most endurance.
Have both of you take a turn holding up the barbell above your head for as long as you can, using a stopwatch to clock the time.