Generally, cheat curls are performed with 5-10% more resistance than regular curls.
Cheat curls are ideal for this because you're already working with much more weight than you would with conventional curls. Eccentrics also allow the lifter to apply roughly 130% more load than they could during the concentric section.
This means that cheat curls are a fantastic way to stimulate muscular adaptation because the load is significantly more than what would be employed on a lighter concentric-based curl.
Therefore, the correct option is a, 5-10%.
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