Cheryl told her contestants on The Greatest Dancer to "push your body until it hurts" as they rehearsed for the live shows.
This Saturday will see the dance captains take to the stage together with their performers in a "spectacular opening show" in the first live show of the series.
But a first look at the groups in training have revealed their captains are not letting them get away with slacking, especially Cheryl, as she drills them relentlessly.
In the trailer, she is first heard says: "The competition is on," after which Matthew Morrison said: "Join us as we go head to head in the first live challenge show."
Cheryl tells her contestants to ‘push it until it hurts’
She counts them in as they rehearse
Her advice may not have been what people expect
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Captain Oti Mabuse then added: "This time, the power is in your hands."
After they announced the competition would be getting going again, the captains were seen in rehearsals, drilling their dancers and trying to get the best out of them.
Matthew is first seen with the young lads James and Oliver, who are dancing with canes in an amazing performance, before Oti is seen clapping her hands and shouting "focus, focus!" at her dancers.
But the stranger moment came after when Cheryl was seen mentoring her dancers, where she saw one of the dancers do a particular move where she pushes her chest forward and her bottom back.
Cheryl has some things to tell her group
The captains together
(Image: BBC/Syco/Thames/Rahul Bhatt)
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To give her some advice, Cheryl stopped them and told her: "Push it until your body hurts," as she tried to show her what the move should look like.
After this, a glimpse of all the acts is seen, as Oti is seen doing salsa walks with and figures of eight with her young performers, while Cheryl stands at the back of room watching a group of dancers leap and spin in amazing style.
But will the captains be able to keep up with their performers when they all jump on the stage together.
The Greatest Dancer airs on Saturday at 7.30pm on BBC1.
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