Grab your dumbbells and put one leg back on a STABLE chair or bench. The higher up you put your foot, the more difficult this exercise is going to be. You’ll want to make sure that you’re in a wide stance so that when you bend your knee it doesn’t go past your toes. As you go down, do a curl. Repeat 15 times for each leg. Beginners do 5-10 reps for each leg.