I like that! If I where to guesstimate...

If we are taking into account all the kinetic and thermodynamic energy involved... Mechanical movements and body heat... It's gotta be... Considering avg body size and metabolic rate... Idk... A lot! 😂😂😂.

You could wear a wakanda suit and use gym equipment designed as explained above to maximize electricity gain. Suit powers up and then is discharged after gym sesh for example. 🤙🏽💯✊🏽