Swimming not counted as being active?

Hello!

I have a one problem with how the data is being measured. I don't understand why "Pool Swim" is not counted as time being active?

For example when i walk 10 minutes to pool, swim there for an one hour and walk back 10 minutes, then my daily active time is being counted for only 20 minutes. It's pretty weird that taking out a trash for a minute counts as being active and then swimming, no matter how long, isn't.

I don't do anything other then swimming. Doesn't really keep up the motivation when being in pool for 3-4 hours in a week and not getting any activity time.