💪 Preacher Curl Form Guide
Isolate your biceps for peak development.
SportsReflector AI analyzes your Preacher Curl form by tracking key joint angles and body landmarks. We monitor elbow flexion and extension, shoulder stability, and wrist position to ensure optimal bicep isolation and minimize injury risk. Metrics tracked include range of motion, tempo, and consistency of movement.
Primary Muscles
Biceps Brachii
Equipment
Preacher Curl Bench, Barbell or Dumbbells
AI Score Categories
6 metrics tracked
What AI Analyzes in Your Preacher Curl
SportsReflector tracks 6 key metrics to generate your 0–100 form score.
AI Form Score
Every Preacher Curl session gets an overall form score plus category-level scoring for each metric above.
4 Preacher Curl Mistakes AI Catches
These are the most common Preacher Curl form errors — and the ones most likely to cause injury or limit your progress.
Failing to fully extend the arms at the bottom or fully contract the biceps at the top reduces muscle activation and limits strength and hypertrophy gains. This often occurs due to using excessive weight, leading to an incomplete stretch and squeeze.
Fix: Use a weight that allows for full elbow extension (to approximately 160-170 degrees) at the bottom and complete elbow flexion (to approximately 30-40 degrees) at the top, ensuring a deep stretch and peak contraction.
Lifting the shoulders or upper back off the preacher bench pad during the curl indicates excessive momentum or weight. This shifts tension away from the biceps to the shoulders and lower back, increasing the risk of shoulder impingement or lumbar strain.
Fix: Maintain constant contact between your upper arms/chest and the pad throughout the entire movement. Reduce the weight if necessary to ensure strict form and bicep isolation.
Allowing the elbows to hyperextend (lock out excessively) at the bottom of the movement places undue stress on the elbow joint and surrounding ligaments. This can lead to elbow pain, tendonitis, or even acute injury over time.
Fix: Stop just short of full elbow lockout, maintaining a slight bend (approximately 170-175 degrees) to keep tension on the biceps and protect the joint. Control the eccentric phase to prevent 'dropping' the weight.
Bending the wrists excessively (either flexing forward or extending backward) during the curl can lead to wrist discomfort, reduce the force transferred to the biceps, and potentially cause wrist strain or carpal tunnel issues over time.
Fix: Keep your wrists straight and neutral throughout the entire movement, aligning them with your forearms. Imagine holding a ruler across your knuckles and forearm to maintain a flat plane.
Muscles Worked
Get Your Preacher Curl Form Score
Record your Preacher Curl on your iPhone and get an instant 0–100 AI form score with specific corrections for every mistake above.
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Frequently Asked Questions
Everything you need to know about SportsReflector
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