While a standard full-body, fast-paced HIIT session might not get your muscles burning, using isolating exercises will fire your legs up. “When you focus on one body part, you’re really pushing your muscles to the max,” says fitness trainer Emma Obayuvana. “You can tap into the muscles in order to really exhaust them.”

You’ll feel the benefits when you do manage to drag yourself outside too, as you’ll be working on muscular endurance which will help to carry you further and faster on runs. Although the idea is that you move fast, form is really key here. Make sure you’re comfortable with the moves, staying stable throughout each exercise, so you don’t injure yourself.

20-minute HIIT workout: this lower body cardio is great for when you don’t fancy running