Welding and turning. I watched a competent metal worker on a lathe, its thinking in 3D writ large. welding is making one thing from two. its increadibly hard to do well. (gas tight)<p>Baking. I worked briefly in a bakery in the 1980s and there is something about the midnight shift, making the bread for the morning. I know its an unhealthy lifestyle.<p>I know a gypsy brewer who now runs his own microbrewery. I'd haul sacks all day to be part of the cycle of a complete brew to keg.<p>We spend far too much time in our heads online in the ICT business. I'd use my free summer to learn how to integrate body and mind.<p>I'm at the back-end of my working career btw.