Start in a plank position with your legs wider than hip-width distance; the wider stance makes you more stable. Hold onto your dumbbells, keeping your wrist locked to protect the joint.
With your core tight and your glutes engaged, exhale, stabilizing your torso as you lift your right elbow to row; feel your right scapula sliding toward your spine as you bend your elbow up toward the ceiling.
Keeping your neck long and energized, return the weight to the ground.
Do as many rows as you can in 40 seconds, followed by a 20-second rest.