Four moves and 20 minutes is all you need to boost your metabolism and build stronger legs

Weights can be a great way to work your muscles, but one of the best ways to build strength and boost your metabolism is by using the power of your own body weight. 

And they're no less effective, as they can boost your balance and stability, and strengthen your core, even without dumbbells or kettlebells. Since you don't need equipment, you can do them from anywhere, too; the gym, home, or even your local park. 

This workout from Stef Williams, personal trainer and founder of the fitness app WeGLOW, is the perfect example of how simple but effective high-intensity workouts can be. Williams uses high-intensity interval training (HIIT) to help you get fit and strong quickly.

With just four exercises and 20 minutes, you'll build strength all over, while getting a sweat on too. Williams does recommend using a skipping rope for one exercise and skipping will help you improve coordination and core strength, if you have a rope.

But, you can just as well swap it out with running on the spot, or even jumping on the spot without a skipping rope. For the rest of the exercises, you can practice your technique with Williams' demonstrations before starting. 

Watch Stef Williams' four-move HIIT workout

This workout requires both power and precision, so think about putting all of your energy into each move and trying to maintain the movement quality, even as your body becomes fatigued.

Ensure you're reaching full depth during the lunges and squats. Try to touch your knee as close to the floor as you can during the jumping lunges and let your hips drop below parallel when squatting.

Make sure you engage your core muscle during the entire workout by tucking in your ribcage and squeezing your abdominal muscles. Your back shouldn't be arched and your pelvis should be tucked in when your core is engaged.

Your heart rate will rise during this session and you'll probably be feeling pretty sweaty by the end of it, so take the time to cool down. This 10-minute yoga routine is great for stretching out tight muscles and easing any tension.

Recovery tools like foam rollers will also help you wind down after a workout, and reduce the impact of DOMS (delayed-onset muscle soreness). Take a look at our guide to the best foam rollers if you want to aid your recovery at home.