This schtick does nothing on it's own; in concert with SkillsoftSocket or SkillBank, it enables you to use these enhancements with physical skills.
If you use skill wires during a fight or other action sequence, you will overstrain your body, who is not really fit and exercised to perform these maneouvers. At the end of each sequence, you will take a number of WoundPoints equal to the difference between your normal skill (or default attribute) and the cyber-enhanced skill value.