PDAs
It was not digital at all, probably looked much like a calendar.
So you can do certain things like run long distances, be able to lift heavy things, and for flexability so you don't pull a hip when your 25.
You want to be physically fit so you can live a long life without lots of health problems. Being mentally fit is also important. If you don't believe in yourself or don't like who you are than you...
a PDA