Single Leg Barbell Curls

Standing on one leg, barbell in hand, tighten your stomach and curl the bar 

all the way up to your chest and bring it all the way down to your thighs. Make

sure you are not swinging the barbell, but keeping the motion as fluid as 

possible. Finish your set amount of reps and when you come back to this

exercise, make sure to switch to the leg that you were holding up in the 

first set.