How much walking to be comparable with a gym/swim session?

[Pileofstuffatthebottomofthesta]

I need to do more exercise...I have a Fitbit and on a good day will do 15-20k steps - would you count this as your exercise for the day or is it not intense enough to be beneficial. My walking often constitutes a school run for example so no power walking there!!

is walking 15-20K steps usual for you? if so how long have you been doing this level of activity.

I do it 2-3 days a week. Most other days it's 10k but sometimes less. I've been doing it since August but only because of school runs so it's slow walking rather than at any pace