-Complete 5 sets of 5 reps with the heaviest load that you can squat.
-If you don't have access to a barbell and some iron then you can use anything heavy that you can lift in to a suitable position. You might find it's easier to hold an awkward load in a front squat, or even a goblet squat position (google them) and that's fine.
-Keep your back arched, heels on the ground, knees out over the toes and squeeze your glutes throughout the squats.
-Remember to stretch before you go find some food!
Note: Lifting heavy loads can be dangerous if done incorrectly, if in any doubt, consult a specialist.