Smith Machine Lunge/Squat Combo

Set 1: 50/50
Set 2: 70/70
Set 3: 90/140
Set 4: 90/140
Set 5: 90/180

Smith Machine Lunges
Do four reps on one leg, then quickly switch to the other leg and do four reps. Then go back to the other leg and do four reps, then four on the other. Each leg gets 8 total reps so you don't have one leg that's significantly more annihilated than the other when you squat, plus you can use heavier weight. Increase the weight after each set of lunges as you'll be supersetting the lunges with Smith machine squats. Then...

Smith Machine Squats
Throw a 45-pound plate on top of your lunging load and do 8 deep reps. For example, use 25 pounds on each side for the first set of lunges, and then add a 45-pound plate for the deep Smith machine squats. On the next set do 35 pounds on each side for lunges, and then add a 45-pound plate on top for squats, etc. These are tough