The cutting to required length of workpieces from stock bars or rods of both ferrous and non-ferrous material using a power saw. Power sawing can be done by reciprocating power hacksaws, by metal cutting band saws and by special chop saws designed for cutting metal.
Making a fruit salad can be useful to improve knife skills. The same practical skills are an essential part of working with food.
To extend this further the fruit could be part of a more complex dish, or the fruit could be swapped for vegetables as ingredients for soup or other recipes.