Keep weight off
Mid-life crisis (reason I ran a Marathon and want to do an Ironman in the future)
Wife is a Runner
Son ..(although he is only two want to set a good example)
Father in Law ex elite runner
Solitude (bit of a loner really)
Cheap..ish (trainers,races,gear all exceptions)
Bragging rights
Listen to Naff music when running (John Farnham the voice anyone ?? or Chariots of Fire)
And lots of others ....