Cleans / Power Cleans

Barbell

This is a good video of the strict technique, but my view is that you can choose to involve as little of your legs as you choose according to how much emphasis you want to put on them. As a rule, the heavier the weight, the more you will need the legs.

Single-Arm Dumbbell

This is a slightly unusual video, but it's the only one I could find that illustrates what I believe to be a single-arm dumbbell clean. Some people seem to think other, more controlled, rear-delt targeting movements can be classed as cleans. I disagree.