Start standing with both feet hip-width apart. Hold the dumbbells together at chest height, palms facing each other.
Looking straight ahead, bend at both the hips and knees, ensuring that your knees remain in line with your toes. Continue bending your knees until your thighs are parallel with the ground. Ensure that your back remains within a 45- to 90-degree angle to your hips.
Drive through your heels to return to standing. This counts as one rep.
Do as many reps as you can in 45 seconds while maintaining proper form. You can modify the movement by dropping one or both of the weights.