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Flexibility is an important consideration when selecting scuba fins. Some fins are extremely stiff while others are quite flexible. Stiff fins are better for frog kicking than very flexible fins and work well for advanced propulsion techniques such as helicopter turns and backing up. For flutter kicking, stiff fins will usually propel a diver farther per a kick cycle than a similarly designed, more flexible fin.
However, flutter kicking through an entire dive with very stiff fins can be exhausting.
By Natalie Gibb - Scuba Diving Export - About Sport