The 42-year-old showed off her tan while wearing the two-piece as she stood facing the camera alongside her pal.
The pair then both attempted to show off their acrobatics but ended up "chickening out."
Gallacher uploaded the video in slow motion and her followers were quick to have their say.
Alongside the video she wrote: "We both chickened out of the back flip then #MustDoBetter #Idiots"
One fan said: "Is there anything you don't look on fire doing? I've used up all my phone battery watching that."
And another wrote: "You nearly fell out of that top."
Gallacher spent almost 20 years at the top of sports broadcasting with Sky.
But the company announced in May that she would be leaving "to do something fresh."
She has just landed a surprise temporary role at Classic FM starting on August 18.
Gallacher will be filling in for Alexander Armstrong's weekend afternoon show for two weeks.
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