(M)ost metals form an oxide layer when exposed to oxygen. Some are bad, but some "passivate" the surface, protecting it from corrosion (e.g., aluminum) nudes
Do you prefer to defer, or do you want the ball[s] now? I like being in charge, but you could be the "head" coach and make sure we each get in plenty of practice – I think two-a-days would be the bare (M)inimum