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Bicep Curl & Muscle Length

The biceps are responsible for flexing the elbow, supinating the wrist, and to a small degree flexing the shoulder.Thus…
A. Shortened: High Cable Biceps Curl
B. Mid: Preacher Curl
C. Lengthened: Face-Away Low Cable Curl

Which one is the best exercise for bicep growth?

My Foot Observation Scan

Heel Angle (deg)
Left - 7deg Eversion - Mild
Right - 9deg Eversion - Severe
Mild < (4~8) Moderate < Severe
Leg Angle (deg)
Left - 2deg Inversion - Mild
Right - 3deg Inversion- Mild
Mild < (4~8) Moderate < Severe

Moving forward when it comes to posture and assessments it is important to address issue regards to foot deviations.

common compensation for barbbell curl.

corrected uneven shoulder

corrected uneven shoulder

Concentric and eccentric phases of a barbell curl.
A) The concentric phase occurs when the biceps shorten (barbell elevates) against the direction of resistance.
The concentric phase requires elbow flexion through full ROM while maintaining postural control.
B)The eccentric phase occurs when the biceps lengthen (barbell lowers) to yield the direction of resistance.
The eccentric phase requires elbow extension through full ROM while maintaining postural control.