Forget the gym — this 20-minute workout builds full-body muscle and boosts your metabolism with just 2 dumbbells

Man doing a dumbbell workout
(Image credit: Getty Images)

Even with the best will in the world, finding the motivation to venture to the gym for a workout during the colder months can prove tricky. But that’s where at-home classes, like this lower body strength workout, step up to the plate.

Using a pair of dumbbells, NASM-certified personal trainer Kayleigh Cohen has created a 20-minute session that has been compiled into an efficient high-intensity resistance training (HIRT) class.

So not only will it help you carve out muscle in your legs, glutes and thighs, it will get your heart rate up and give your metabolism a boost, too. Of course, weighted HIRT workouts won’t be right for everybody.

For example, if you’re new to exercising, it’s worth mastering the best beginner workouts and learning how to lift weights properly with the correct form. However, if you’ve nailed the basics, this weight-training workout could be just the thing. So grab your adjustable dumbbells and prepare to get started.

Watch Kayleigh Cohen's 20-minute dumbbell workout

20 minute MUSCLE BUILDING Lower Body Strength Training - YouTube 20 minute MUSCLE BUILDING Lower Body Strength Training - YouTube
Watch On

This workout contains 16 exercises in total, split evenly across four circuits. The lower body exercises include the likes of a Romanian deadlift, glute bridge, squat, stationary lunge and sumo squat.

In each circuit, you’ll complete the first and fourth exercises for 60 seconds and the second and third exercises for 40 seconds. You’ll have a 20-second rest period between each exercise. But if you need more time, simply pause the workout and take what you need.

To do this workout, Cohen uses a mix of dumbbells ranging between 10 lbs to 25lbs. “When selecting a weight for this workout, you want to lift moderately heavy to heavy,” the trainer advises.

“Weight is relative to you and each individual exercise. It should feel challenging for the entire work duration.” So in other words? Pick a weight that’s right for you and your body.

What are the benefits of HIRT?

HIRT is very similar to its much-loved workout cousin, high-intensity interval training (HIIT). However, the main difference with HIRT is that you use weighted resistance, like dumbbells, looped resistance bands and/or kettlebells.

This shifts the focus from cardio (which is the main feature of any HIIT workout) to strength training. That said, if you maintain a high heart rate throughout your HIRT workout, this style of training will give your cardiovascular system a boost too — more so than just your average leg day, arm day or full body workout.

Cohen’s workout will raise your heart rate, but it focuses on form rather than speed. This helps increase the time under tension (TUT), which makes each exercise more challenging and can help you build muscle without lifting heavier weights.

More from Tom’s Guide

Becks Shepherd

Becks is a lifestyle journalist who specializes in writing about wellness and home products, from mattresses to weighted blankets and cooling comforters. She has tested a number of mattresses for Tom's Guide, putting them through their paces to see if they stand up to the brand's claims, and offering recommendations as to the type of sleeper they will (and won't) suit. 

Read more
Man on exercise mat in studio performing a single leg Romanian deadlift with left leg raised and holding two dumbbells
No time for the gym? Strengthen your entire body with this 35-minute dumbbell workout instead
Man performing a dumbbell squat at home
Skip the gym — this 30-minute home dumbbell workout builds core and lower-body strength
a woman performing dumbbell lunges
Forget the gym — this 5-move dumbbell workout builds stronger legs in just 20 minutes
Man in home on an exercise mat performing a dumbbell renegade row with left arm lifted in row position from plank
This 10-move dumbbell workout only takes 10 minutes to build a stronger body and boost your metabolism — here's how to do it
the back of a man performing dumbbell presses
Forget lunges — this 20-minute standing dumbbell workout strengthens the whole body
Woman holding two dumbbells out in front of her at shoulder height during outdoor workout in the sunshine
You only need 2 dumbbells and 20 minutes to build full-body muscle and boost your metabolism
Latest in Fitness
Man in a low squat with arms extended at shoulder height during gorilla walk exercise
Mobility coach shares 'squat like a baby' routine to boost lower-body flexibility and improve hip health
a photo of a woman with strong abs
I tried this 7-minute intense core workout — here’s what happened to my abs
Left image Jordan Chiles, right image Simone Biles both competing in gymnastics
I tried Olympic Champion gymnast Simone Biles’ ab workout — here’s what happened to my core
Close-up photo of the black version of Samsung's Galaxy Ring held between thumb and index finger in front of a garden.
Samsung patent suggests a future Galaxy Ring will include a temperature sensor — here's how it could work
a woman's abs
Forget sit-ups — build core strength and boost your mobility in just 15 minutes with this Pilates routine
a photo of a woman with strong arms
Swerve the gym — this 20-minute dumbbell workout can be done from home and will build a stronger upper body
Latest in Features
Nothing Phone 3a Pro vs Pixel 8a.
I shot over 200 photos with the Nothing Phone 3a Pro vs Pixel 8a — here’s the winner
Man in a low squat with arms extended at shoulder height during gorilla walk exercise
Mobility coach shares 'squat like a baby' routine to boost lower-body flexibility and improve hip health
The Silent Beacon Bluetooth panic button worn on a wrist next to a Fitbit
I tried a physical panic button for 48 hours — and this tiny device already makes me feel safer
A woman with long dark hair sits up in bed with her arms stretched in the air as sunlight streams in through her open curtains
You lose an hour of sleep this weekend, here’s why that’s a good thing
the dyson airwrap ID in teal and terracotta colorway (patina and orange) with a lapis case, with a brush, hairfryer, curling wand attachments
I’ve ruined my hair with 3 years of perms — but the new Dyson Airwrap ID saved my locks
Apple Watch Ultra 2 on a black silicone strap and Amazfit T-Rex 3 on an orange silicone strap shown side-by-side on a user's wrist
I walked 10K steps with Apple Watch Ultra 2 vs Amazfit T-Rex 3 — and this one was more accurate