45-Minute Full-Body Dumbbell HIIT Workout
For a Major Muscle-Building Challenge, Try This 45-Minute Dumbbell HIIT Workout

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Block 1, Exercise 1: Side Lunge to Center Squat
- Start standing with your knees slightly wider than hips-width apart. Hold a dumbbell in each hand at chest height, pressed together with your palms facing each other.
- With your right foot, take a wide step out to the right.
- Looking straight ahead, bend at the hips and right knee, ensuring that your knee remains in line with your toes. Keep your core pulled in towards your spine and your chest lifted. Let your left leg extend straight as you lunge to the right.
- Drive through your right foot to come back to standing, simultaneously stepping back to the starting position.
- From the starting position, go into a squat by bending at the hips and knees. Continue to keep your knees behind your toes and your core pulled in toward your spine.
- Drive through your heels to stand and return to the starting position. This counts as one rep.
- Do as many reps as you can in 45 seconds while maintaining proper form. Squat on your right leg for the first and third sets and your left for the second and fourth sets. You can modify the move by dropping the weight.