By
Hanna Flint
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When it comes to her fitness, Jessie J means business.
The popstar shared some pictures and a video of herself working out at the gym, and she was getting pretty serious about it.
Jessie flexed her muscles and threw some air punches while she lifted some weights on a leg extension machine.
Work hard, train hard: Jessie J gets her serious face on in the gym
The British singer showed off her impressive figure in a white Nike sports bra and black leggings which let her display her toned stomach.
She added some colour to her outfit with a red cap worn over her inky black hair extensions.
In additional photos, Jessie performs a few different exercises on a mat, including bicycle crunches, squats with dumb bells and leg raises.
Parking it: The singer puts on a shoe for a video while on a leg extension machine in