LongformLongform · Movement study
Biceps Curl
Supplement pulling with an observable elbow-flexion task, recording controlled repetitions.
Current example: Dumbbell Biceps Curl。The starting example uses bilateral dumbbell curls.
Scene controls: arrow keys rotate; + / − zoom. Camera controls also support every operation.
Loading 3D. A 2D illustration on the same timeline is available now.
Stand stably with upper arms near the body and dumbbells hanging naturally at the sides.
Lines show grip points or joint paths; dots mark the start and extension checkpoints, with the finish returning to the start. A dead-bug cycle illustrates both sides; actual repetitions are counted per side. The range is illustrative, not a required depth.
Original joint models and animations are teaching illustrations without motion capture or individual calibration. Playback starts paused. Reduced-motion use can inspect checkpoints and the timeline. Camera rotation spans 360°, and zoom only changes viewing distance.
Paused by default. Choose a checkpoint or play to observe a full repetition.
Observation and Equipment
Equipment: Dumbbells
- Keep the torso stable and upper arms near the body.
- Flex the elbows to lift dumbbells with naturally aligned wrists.
- Control lowering while continuing to breathe.
Joints: Elbow joint, Wrist joint, and Shoulder joint
Safety and Scope
- Stop for wrist or elbow pain; do not jerk through repetitions.
Movement-learning information for healthy adults without known exercise contraindications. Sources are reviewed; this does not replace on-site technique assessment.
Reduce Difficulty
- Use light dumbbell curls, prioritizing stable upper arms and torso.
Adjustment Boundaries
- Adjust under the plan after controlled, comfortable lifting and lowering. Swinging repetitions are not technical progress.
Movement Information Sources
- Mayo Clinic · Strength training: Get stronger, leaner, healthier (reviewed: 2026-10-14）
- Mayo Clinic · Strength training: How-to video collection (reviewed: 2026-10-14）
- NHS · Strength exercises · Biceps curls (reviewed: 2026-10-14）
Sources support movement information and safety boundaries. Original model proportions, coordinates, and animation timing are teaching design, not source measurements or personal training prescriptions.