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10th June 2019
08:00am BST

Here's how it works: Doing what is called a "countdown workout," you start with 15 reps of the kettlebell or dumbbell swing, followed immediately by 15 reps of the squat thrust. With no rest after, you then start with 14 of each, then 13, until you're down to 1.
It is hard, ladies, there is no doubt about it. The movements are done at a fast pace, without rest, and will challenge your whole body. All in all, the the routine takes about 12 minutes to do in total, so your muscles are burning.
(Tip: If it's too hard to do at first, you can start with a lower number, and work your way up to managing the full 15 reps).