🕷️ Spider Curl Form Guide
Isolate your biceps for peak development.
SportsReflector AI analyzes your Spider Curl form by tracking key landmarks such as your elbow, shoulder, and wrist joints. We monitor elbow flexion and extension angles, ensuring full range of motion and proper bicep contraction. Our analysis detects common errors like excessive shoulder movement and incomplete lockout, providing a precise technique score.
Primary Muscles
Biceps Brachii
Equipment
Preacher Curl Bench or Incline Bench, Dumbbells or Barbell
AI Score Categories
6 metrics tracked
What AI Analyzes in Your Spider Curl
SportsReflector tracks 6 key metrics to generate your 0–100 form score.
AI Form Score
Every Spider Curl session gets an overall form score plus category-level scoring for each metric above.
4 Spider Curl Mistakes AI Catches
These are the most common Spider Curl form errors — and the ones most likely to cause injury or limit your progress.
Allowing the shoulders to lift or shrug during the curl indicates that other muscle groups are assisting, reducing the isolation on the biceps. This compromises the exercise's effectiveness for bicep development and can place undue stress on the shoulder joint.
Fix: Keep your shoulders pinned down and back throughout the entire movement. Focus on initiating the curl solely with your biceps, ensuring your upper arms remain stationary against the bench.
Failing to fully extend the arms at the bottom or fully contract the biceps at the top limits the muscle's work and growth potential. Partial reps reduce the time under tension and the stretch stimulus on the bicep.
Fix: Ensure a full elbow extension at the bottom, feeling a stretch in the biceps. At the top, squeeze your biceps hard, aiming for maximum contraction. Control both the eccentric and concentric phases.
Swinging the weight up by using body English or hip drive indicates the weight is too heavy or control is lacking. This shifts the focus away from the biceps and increases the risk of lower back or elbow injury.
Fix: Select a weight that allows for strict form. Initiate the movement slowly and deliberately, focusing on a smooth, controlled curl without any jerking or swinging motions.
Allowing the elbows to flare out to the sides during the curl can reduce bicep activation and place unnecessary strain on the elbow joint and shoulder capsule. It often indicates a lack of control or an attempt to lift too much weight.
Fix: Keep your elbows tucked in and directly under your shoulders throughout the entire movement. Imagine your elbows are glued to the pad of the preacher bench to maintain optimal bicep isolation.
Muscles Worked
Get Your Spider Curl Form Score
Record your Spider Curl on your iPhone and get an instant 0–100 AI form score with specific corrections for every mistake above.
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