There are a few different hand placements for the front squat, so be sure to choose the one you are most comfortable with. If you are able, increase the weight a little to further challenge yourself.
Any time you use a barbell, you can add weight to it. In this circuit, you can use one barbell or a different one for each exercise. After each of the five rounds, take a rest, add or remove weight, then get back to getting fit.