Most Side-Seated Rear Delt Flies

Canada

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Calgary, Alberta, Canada / November 13, 2026

Stefan Popovic sat sideways on a rear delt fly machine at a gym in Calgary, Canada, and completed three one-armed flies at 310 pounds: the pin in the bottom plate of the 300-pound weight stack plus the machine's two 5-pound add-on weights. The video opens on the pin and both add-ons, then a phone on the floor films his right arm sweeping the handle out to shoulder height as the full stack rises off its rest. RecordSetter watched the stack lift on all three reps in the continuous clip, one more than his earlier mark of two. Sideways, one arm, the whole stack, three times.

Tags: exercise, strength, fitness, weightlifting, one-handed

Rules

- Must use a selectorized rear delt fly machine with the weight stack set to 300 pounds; the weight is the machine's indicated stack setting, not a free-weight equivalent.
- Must sit sideways on the seat, side-on to the machine, and work one handle with the same arm throughout the set.
- Each fly must sweep the working arm out to the side until it is level with the shoulder, lifting the weight stack off its rest, and return the handle to its starting position.
- The non-working hand may brace the body but must not help move the working handle or lift the weight stack.
- Repetitions must be completed in one set; the set ends when the working handle is released or the performer leaves the seat.
- Must provide continuous video showing the selected weight and every repetition.
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