The R&B singer, 28, posted a collage of videos to Instagram over the weekend alongside the caption: "GOOD DAY! This is how I spend some of my monrings."
She added the hashtag "Keeping my body activated."
Watch Ciara working it out in the gym:
Ciara's baby bump was clear to see in her tight blue T-shirt and black leggings as she hit the cross trainer and weights machines with her instructor.
The 'Love Sex Magic' singer announced her pregnancy at the start of this year by proudly showing off her baby bump on US TV show The View.
Gorgeous Ciara celebrated her baby shower at a bash in Los Angeles earlier this month with the help of celebrity friends including Kim Kardashian and Kris Jenner.
Ciara became engaged to musician Future on her 28th birthday last October.
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Copyright: WENN Lexie Appleby/Future Image/Bridow/Instagram