A hand is planted on the bench, but the dumbbell still seems to need one last heave. Lifting the working shoulder and turning the chest upward can take the weight higher. In a supported one-arm row, that extra travel makes it worth checking what is actually moving.
The American Council on Exercise gives this version a specific stopping cue: finish the pull before lifting farther requires rotating the torso. The bench supplies support, while the lifter still has to maintain the intended position.
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Make the bench part of the setup
PureGym’s exercise guide describes a single-arm row with the hand and knee on the non-working side supported by a bench. The other foot stays planted on the floor, and the working arm starts extended toward the floor.
Press the supporting hand firmly into the bench rather than simply resting it there. Keep your back in a neutral position and brace your trunk. That gives the pull a stable starting point before the elbow begins moving backward.
The supported position is different from standing with two dumbbells and maintaining the hinge without a bench. It provides another way to arrange the exercise when holding that position is becoming the limiting task. The support is part of the chosen variation, rather than evidence that the row is less worthwhile.
Follow the elbow without opening the chest
In ACE’s single-arm row instructions, the upper arm travels backward close to the side of the body. The torso stays in position as the elbow bends. The endpoint is reached when continuing upward would require turning the body.
Think of the difference between moving the arm beside a steady rib cage and lifting the whole working side toward the ceiling. Both can move a dumbbell through space, but they are different actions. A higher finish alone does not show that the supported pulling movement continued farther.
ACE also calls for a controlled return while maintaining the back position. Let the arm extend into the starting position without using the lowering phase to roll the chest toward the floor. Exhale during the pull and inhale while lowering.
Our guide to dumbbell back exercises includes kneeling single-arm rows alongside other pulling movements; this detail concerns how to finish that supported row.
Know which version the program intends
Rotation can be deliberate in a different exercise. [P]rehab’s rotational row instructions specifically add an upper-body turn as the dumbbell comes up, while keeping the lower body from rotating. That is an explicit part of that variation, rather than an extra movement quietly added to a still-torso row.
For the ACE version, a mirror can help reveal a changing torso position. PureGym also recommends a weight that can be moved in both directions with control. If the last repetitions require heaving the dumbbell, reassess that load before treating the extra motion as part of the target exercise.