What counts as ‘moderate’ exercise?

I had a quiet walk to the library today

Solihull Website - News:
"Moderate exercise can be anything from walking the dog to heavy gardening, so why not have a go at some of these:
30 minutes of dancing
30 - 45 minutes of gardening
45 minutes - 1 hour washing the car
45 minutes - 1 hour washing the windows or the floor
20 - 45 minutes of swimming, football or volleyball
Walking 1½ miles
Cycling 5 miles"