40 minutes a day
Back before many readers of this blog were born, there was a TV ad campaign “Life, Be In It“, encouraging us all to be more active. It featured a jolly, middle-aged, mildly overweight character called Norm (as in Norm Everage), and a jingle on the merits of “Thirty Minutes a Day” of moderate exercise.
I think of myself as a lot more energetic and exercise-oriented than Norm, and being a data fan, I record most of my exercise using Runkeeper. So, I finally got around to checking the duration stats and was surprised to find that I do only about 20 hours of running, cycling and swimming in the average month. That’s just 40 minutes a day. You can take from that what you will, but my thought is that, unless you’re aiming to qualify for the Boston Marathon, or, like me,you just enjoy exercise, Norm was right. 30 minutes a day is all you need.
fn1. That doesn’t including walking, short cycle trips to work and the shops, and occasional gym workouts, but those things wouldn’t add more than 20 mins a day.