Answer:
The initial difficulty for a gym brah to complete a bicep curl from full extension is primarily due to the increased resistance at the starting position.
Step-by-step explanation:
When performing a bicep curl, the muscle experiences the greatest resistance at the point of full extension. This is because, at this stage, the lever arm (the distance from the joint to the weight) is at its longest, requiring the bicep to exert more force to lift the weight. The force generated by the bicep needs to overcome the gravitational pull acting on the weight, making it more challenging to initiate the curl from a fully extended position.
As the angle of the joint changes during the curl and the lever arm shortens, the resistance decreases, allowing for a smoother movement through the range of motion.