Count aloud in phrase units, not single beats. Counting "1-2-3-4-5-6-7-8" tells the dancer where they are. Thinking in four-bar and eight-bar phrases tells you where the exercise is going. Train both.
The tempo you set determines the quality of movement. A too-fast waltz becomes a race; a too-slow 6/8 loses its lilt. When an exercise fails, check the tempo before changing the choreography.
Give your pianist information, not just numbers. "A slow waltz" is more useful than a metronome marking alone. Tell them the character you want: lyrical, driven, ceremonial, playful. Name the composer if you have one in mind. Mark musically, using your voice to demonstrate mood and accent. A skilled accompanist will respond to that as readily as they will to a word or a name, and almost always more readily than to a click.
Listen for phrase shape, not just pulse. Good music for ballet has a harmonic arc across four or eight bars — tension building, resolution landing. Choreography that ignores this arc will always feel arbitrary. Choreography that follows it will feel inevitable.
Distinguish metre from rhythm. Metre is the grouping of beats (3/4, 6/8, 2/4). Rhythm is the pattern of long and short notes within that grouping. A waltz and a mazurka share a metre; their rhythms are quite different. A good teacher hears both.
Use the listening examples actively. Before teaching a character rhythm for the first time, listen to the recommended recordings — not as background, but with attention. Ask: where is the accent? What does the body want to do? What quality of step does this music invite? Your body already knows more about rhythm than your intellect; the recordings will unlock it.
Silence counts. Rests are rhythmic events. A pause before the opening note, a held fermata, a silence before a jump — these are part of the musical language. Help students hear what isn't played as readily as what is.