Vertical caving terminology and methods > Prusiking systems, prusiking methods
These systems use either use the power from both feet at once, or just one foot. In some cases (such as the frog system), it is possible to make modifications to allow some independent motion between feet. However, in such cases, one foot is always the main driving force, and the other can sometimes work alongside it, or sometimes work in a step-like motion, or sometimes do nothing at all. It is not an essential part of the system. Almost all of these systems will provide the main body support via an ascender attached to the sit harness, giving a seated position for part of the sit-stand cycle.
Most of these systems would leave an incapacitated caver in a seated position, which gives a little more time before suspension syncope takes effect, compared with the normal positions that step systems would produce.
These systems are listed roughly in descending order of where the primary foot powered ascender is placed.
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