1/ Set up
Begin with the barbell in a squat rack at chest height. Lift the bar away by resting it in the crook of your arms and interlocking your hands to create a supportive base.
2/ The step
Loading your weight on the front foot, move your other foot back and sink into a lunge. Slowly drop until your knee almost brushes the floor
3/Return
Driving through the heel of your front foot, draw your back leg in and rise up to the start position. Reckon you can do that nine more times?
4/ Repeat
Aim to perform 3-4 sets of 8-10 reps, two or three times a week. And try to bear in mind that pain is only a temporary thing.