A bit like olympic lifting(but without the press overhead). In one swift but controlled movement lift the barbell off the floor, rotating your arms to bring the bar to rest on your colar bone under your chin. Your palms end up facing the ceiling.

You then put the bar back done, again in a controlled manner.

Start reasonably light to get the correct technique.

This uses legs, back, shoulders, arms and so is very good for all the body.