The bride-to-be can be seen 'flying' across the open mats using suspension training hooks planted in the ceiling. She Tweeted the slightly blurry action shot with the caption...
Fun flying lesson this morning with richtidmarsh http://t.co/YHWIkBqqwu— Millie Mackintosh (@millsmackintosh) August 13, 2013
Suspension training has long been used by body building blokes, but more and more women are turning to the strength exercise to tone muscles and develop a more slimline physique.
In this photo, Millie is using her own body weight to work her core muscles by lifting her lower body towards her chest. She makes it look easy, but it definitely isn't!
The great thing about suspension training is that it can be used by beginners and experts to tackle tricky or stubborn areas of the body, like stomachs, thighs and bums. By altering your stance you can drastically increase or decrease the intensity of your workout - perfect for brave days and lazy days!
We recommend asking a personal trainer before you start swinging monkey bar-stylee in the gym. You don't want to attract any unwanted giggles...
Want to get a bikini body like Millie? Take a look at the Made In Chelsea star's 'Life in Food' below...
What do you think? Does Millie make the gym look fun?
LUCY MECKLENBURGH'S TOP INSPIRATIONAL FITNESS TWEETS
JENNIFER ANISTON BLAMES WEIGHT GAIN FOR PREGNANCY RUMOURS
NAYA RIVERA'S CROP TOP WORKOUT & DIET PLAN
WIN A COPY OF JILLIAN MICHAELS YOGA MELTDOWN ON DVD