When dancers form a circle for couples to show off, now's your chance. Leader has two hands always on follower. Follower has both hands on the leader, although she really doen't need to do so. Wide margin for error. Mild average worst-case scenario.
Leader has two hands on follower, but less margin for error.
More strength required of the follower. More strength and coodination required of the leader. Average worst-case scenario isn't so mild. Abortable up to a point. Leader has one or no hands on follower after lift-off.