Cyber Heart (4e Future Technique)
From D&D Wiki
Your blood, and the pump that distributes it to your muscles, is nano-enhanced and more efficient.
Benefit: You gain a +2 power bonus to Athletics checks and a +2 power bonus to Fortitude
Overcharge: When you start your turn, you can roll a d20
♦10+: Until the end of the encounter, your Athletics and Fortitude bonuses increase to +4
♦9 or less: You are weakened (save ends).