(Of a position) involving a lowering of the body by bending the knee of the supporting leg:an arabesque fondu...
A correct fifth prepares you for a croisé line and for all extensions where your working leg lifts: dégagé, fondu, développé, grand battement, and grand jeté.
I give them a center warm-up, and then center work such as tendus combined with pirouettes, as well as a fondu exercise and adagio.