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Grip the bar/handle at shoulder width, shoulders down and back, core braced.
1. Support one knee/hand on a bench, flat back, dumbbell hanging.
2. Pull the dumbbell to your hip, elbow close to the body.
3. Lower under control to a full stretch.
Exhale as you pull, inhale as you return to the start under control.
Using momentum to yank the weight, shrugging instead of pulling with the back.
Keep the spine neutral throughout; do not let the lower back round to complete the rep.
Beginner: Use a lighter dumbbell, focus on form.
Intermediate: As described.
Advanced: Add a pause and squeeze at the top.